-9 + x = 5x - 7 is "subtract x,"

Question

Choose the answer based on the most efficient method as presented in the lesson.
If the first step in the solution of the equation -9 + x = 5x - 7 is "subtract x," then what should the next step be?

 

Answer 1

-9 = 4x -7

 

the next step is to add 7 to each side

 

-9 + 7 = 4x

 

4x = -2

 

divide by 4 on either side 

 

 

x = -2/4

 

x = -1/2

Answer 2

-9 + x = 5x -7

     - x = -x-7

__________________

-9       = -4x -7

+ 7      = -4x +7     so the next step is to add seven to both sides