Question

X -(4x- 7) = 5 x- ( x+ 21

Answer 1

x=4

Explanation:

The question is

Find the value of x

we have

`x-(4x-7)=5x-(x+21)`

solve for x

Eliminate parenthesis both sides

Remember that

`(-1)(-1)=+1\\(-1)(+1)=-1`

`x-4x+7=5x-x-21`

Combine like terms

`-3x+7=4x-21`

Group terms that contain the same variable

`4x+3x=7+21\\7x=28\\x=4`