The first step of the inverse operation is to subtract 25 on both sides of the equation to cancel out the 25 from the left side:
-8x+25 (-25) = -15 (-25)
-8x = -40
Next, you need to divide -8 on both sides to isolate the variable, which would give you the answer to x. The negatives would cancel out, leaving you with: <em>x = 5</em>