What is x in the equation 12x - (7-3x) = -8x-30

First, you will need to flip the values.

12x - (7-3x) = - 8x - 30

12x - 7 + 3x = - 8x - 30

Add like terms.

15x - 7 = - 8x - 30

Next, add 7 to each side.

15x - 7 + 3x + 7 = - 8x - 30 + 7

15x = - 8x - 23

Now, add 8x to each side.

15x + 8x = - 8x - 23 + 8x

23x = - 23

Divide each side by 23.

x = - 1