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On line Solution of Monovariate Equation：
    Input any unary equation directly, and then click the "Next" button to obtain the solution of the equation.
    It supports equations that contain mathematical functions.
    Current location：Equations > Monovariate Equation > The history of univariate equation calculation > Answer

    Overview: 1 questions will be solved this time.Among them
           ☆1 equations

[ 1/1 Equation]
    Work: Find the solution of equation 31000 = X－［X／（1＋3%）×3%］×（1＋7%）－｛［X／（1＋3%）］×（1－20%）×30%－2000｝ .
    Question type: Equation
    Solution:Original question:
     31000 = X − ( X ÷ (1 +
3
100
) ×
3
100
)(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)
    Remove a bracket on the right of the equation:：
     31000 = X − X ÷ (1 +
3
100
) ×
3
100
(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)
     Multiply both sides of the equation by:(1 +
3
100
)
     31000(1 +
3
100
) = X (1 +
3
100
) − X ×
3
100
(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    Remove a bracket on the left of the equation:
     31000 × 1 + 31000 ×
3
100
 = X (1 +
3
100
) − X ×
3
100
(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    Remove a bracket on the right of the equation:：
     31000 × 1 + 31000 ×
3
100
 = X × 1 + X ×
3
100
 − X ×
3
100
(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    The equation is reduced to :
     31000 + 930 = X × 1 + X ×
3
100
 − X ×
3
100
(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    The equation is reduced to :
     31930 =
103
100
 X − X ×
3
100
(1 +
7
100
) − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    Remove a bracket on the right of the equation:：
     31930 =
103
100
 X − X ×
3
100
 × 1 − X ×
3
100
 ×
7
100
 − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    The equation is reduced to :
     31930 =
103
100
 X − X ×
3
100
 − X ×
21
10000
 − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    The equation is reduced to :
     31930 =
9979
10000
 X − (( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
 − 2000)(1 +
3
100
)
    Remove a bracket on the right of the equation:：
     31930 =
9979
10000
 X − ( X ÷ (1 +
3
100
))(1 −
20
100
) ×
30
100
(1 +
3
100
) + 2000(1 +
3
100
)
    Remove a bracket on the right of the equation:：
     31930 =
9979
10000
 X − X ÷ (1 +
3
100
) × (1 −
20
100
) ×
30
100
(1 +
3
100
) + 2000(1 +
3
100
)
     Multiply both sides of the equation by:(1 +
3
100
)
     31930(1 +
3
100
) =
9979
10000
 X (1 +
3
100
) − X (1 −
20
100
) ×
30
100
(1 +
3
100
) + 2000(1 +
3
100
)(1 +
3
100
)
    Remove a bracket on the left of the equation:
     31930 × 1 + 31930 ×
3
100
 =
9979
10000
 X (1 +
3
100
) − X (1 −
20
100
) ×
30
100
(1 +
3
100
) + 2000(1 +
3
100
)(1 +
3
100
)
    Remove a bracket on the right of the equation:：
     31930 × 1 + 31930 ×
3
100
 =
9979
10000
 X × 1 +
9979
10000
 X ×
3
100
 − X (1 −
20
100
) ×
30
100
(1 +
3
100
) + 2000(1 +
3
100
)
    The equation is reduced to :
     31930 +
9579
10
 =
9979
10000
 X +
29937
1000000
 X − X (1 −
20
100
) ×
30
100
(1 +
3
100
) + 2000(1 +
3
100
)(1 +
3
100
)

    
        X≈30063.082572 , keep 6 decimal places    
    There are 1 solution(s).

解一元一次方程的详细方法请参阅：《一元一次方程的解法》


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