7x-7=13+12x

Subtract 12x from both sides of the equation.

7x-7-12x=13

Subtract 12x from 7x.

-5x-7=13

-5x-7=13

Add 7 to both sides of the equation.

-5x=13+7

Add 13 and 7.

-5x=20

-5x=20

Divide each term in -5x=20 by -5.

-5x-5=20-5

Cancel the common factor of -5.

Cancel the common factor.

-5x-5=20-5

Divide x by 1.

x=20-5

x=20-5

Divide 20 by -5.

x=-4

x=-4

Solve for x 7x-7=13+12x