Incorrect. The first step is a valid one and results in . However, subtracting 9 results in . You probably forgot to divide 9 by 8 when you divided 8x by 8, and you then subtracted again instead of using the inverse of subtracting. Isolating the variable requires performing the same operation to all parts of the expression, and in the correct order. The inverse of -9 is +9, so you would add 9, resulting in 8x. You would then perform the inverse of multiplying by 8, which is dividing by 8. This method would isolate x. So the correct method is to add 9, and then multiply divide by 8.