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current location：Equations > Monovariate Equation > The history of univariate equation calculation > Answer
    Overview: 6 questions will be solved this time.Among them
           ☆6 equations

[ 1/6 Equation]
    Work: Find the solution of equation 2x+16-7 = 30 .
    Question type: Equation
    Solution:Original question:
     2 x + 16 − 7 = 30
     Left side of the equation = 2 x + 9
    The equation is transformed into :
     2 x + 9 = 30

    Transposition :
     2 x = 30 − 9

    Combine the items on the right of the equation:
     2 x = 21

    The coefficient of the unknown number is reduced to 1 :
      x = 21 ÷ 2
        = 21 ×
1
2

    We obtained :
      x =
21
2
    This is the solution of the equation.

    Convert the result to decimal form :
      x = 10.5

[ 2/6 Equation]
    Work: Find the solution of equation x+0.3 = 5.9 .
    Question type: Equation
    Solution:Original question:
      x +
3
10
 =
59
10

    Transposition :
      x =
59
10
 −
3
10

    Combine the items on the right of the equation:
      x =
28
5
    This is the solution of the equation.
    This is the solution of the equation.

[ 3/6 Equation]
    Work: Find the solution of equation 4x+3x = 56.7 .
    Question type: Equation
    Solution:Original question:
     4 x + 3 x =
567
10
     Left side of the equation = 7 x
    The equation is transformed into :
     7 x =
567
10

    The coefficient of the unknown number is reduced to 1 :
      x =
567
10
 ÷ 7
        =
567
10
 ×
1
7
        =
81
10
 × 1

    We obtained :
      x =
81
10
    This is the solution of the equation.

    Convert the result to decimal form :
      x = 8.1

[ 4/6 Equation]
    Work: Find the solution of equation 5x+3x = 72.8 .
    Question type: Equation
    Solution:Original question:
     5 x + 3 x =
364
5
     Left side of the equation = 8 x
    The equation is transformed into :
     8 x =
364
5

    The coefficient of the unknown number is reduced to 1 :
      x =
364
5
 ÷ 8
        =
364
5
 ×
1
8
        =
91
5
 ×
1
2

    We obtained :
      x =
91
10
    This is the solution of the equation.

    Convert the result to decimal form :
      x = 9.1

[ 5/6 Equation]
    Work: Find the solution of equation 2x-3 = 7.2 .
    Question type: Equation
    Solution:Original question:
     2 x − 3 =
36
5

    Transposition :
     2 x =
36
5
 + 3

    Combine the items on the right of the equation:
     2 x =
51
5

    The coefficient of the unknown number is reduced to 1 :
      x =
51
5
 ÷ 2
        =
51
5
 ×
1
2

    We obtained :
      x =
51
10
    This is the solution of the equation.

    Convert the result to decimal form :
      x = 5.1

[ 6/6 Equation]
    Work: Find the solution of equation 2x-3+12 = 40 .
    Question type: Equation
    Solution:Original question:
     2 x − 3 + 12 = 40
     Left side of the equation = 2 x + 9
    The equation is transformed into :
     2 x + 9 = 40

    Transposition :
     2 x = 40 − 9

    Combine the items on the right of the equation:
     2 x = 31

    The coefficient of the unknown number is reduced to 1 :
      x = 31 ÷ 2
        = 31 ×
1
2

    We obtained :
      x =
31
2
    This is the solution of the equation.

    Convert the result to decimal form :
      x = 15.5




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