Mathematics
         
语言：中文    Language:English
Equations   
Fold
Unary equation
Multivariate equation
Math OP  
Unfold
Linear algebra      
Unfold
Derivative function
Function image
Hot issues
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 21-7m-14 = -3m+9+6+(21/2)+(-7m/2) .
    Question type: Equation
    Solution:Original question:
     21 − 7 m − 14 = - 3 m + 9 + 6 + (21 ÷ 2) + ( - 7 m ÷ 2)
     Left side of the equation = 7 − 7 m
    The equation is transformed into :
     7 − 7 m = - 3 m + 9 + 6 + (21 ÷ 2) + ( - 7 m ÷ 2)
     Right side of the equation = - 3 m + 15 + (21 ÷ 2) + ( - 7 m ÷ 2)
    The equation is transformed into :
     7 − 7 m = - 3 m + 15 + (21 ÷ 2) + ( - 7 m ÷ 2)
    Remove the bracket on the right of the equation:
     Right side of the equation = - 3 m + 15 + 21 ÷ 2 + ( - 7 m ÷ 2)
                                               = - 3 m + 15 +
21
2
 + ( - 7 m ÷ 2)
                                               = - 3 m +
51
2
 + ( - 7 m ÷ 2)
                                               = - 3 m +
51
2
 − 7 m ÷ 2
                                               = - 3 m +
51
2
 −
7
2
 m
                                               = -
13
2
 m +
51
2
    The equation is transformed into :
     7 − 7 m = -
13
2
 m +
51
2

    Transposition :
      - 7 m +
13
2
 m =
51
2
 − 7

    Combine the items on the left of the equation:
      -
1
2
 m =
51
2
 − 7

    Combine the items on the right of the equation:
      -
1
2
 m =
37
2

    By shifting the terms and changing the symbols on toth sides of the equation, we obtain :
      -
37
2
 =
1
2
 m

    If the left side of the equation is equal to the right side, then the right side must also be equal to the left side, that is :
     
1
2
 m = -
37
2

    The coefficient of the unknown number is reduced to 1 :
      m = -
37
2
 ÷
1
2
        = -
37
2
 × 2
        = - 37 × 1

    We obtained :
      m = - 37
    This is the solution of the equation.



Your problem has not been solved here? Please go to the Hot Problems section！


Return



  New addition:Lenders ToolBox module（Specific location：Math OP > Lenders ToolBox ），welcome。