Incorrect. Isolating the variable requires performing the inverse of each operation in the correct order. To isolate the variable, you need to perform the inverse of each operation. The inverse of +9 is -9, so you need to subtract 9, which will result in $\displaystyle\frac{{1}}{{3}}{x}\usepackage{cmbright}\Huge\$ . The inverse of dividing by 3 is multiplying by 3, so multiplying $\displaystyle\frac{{1}}{{3}}{x}\usepackage{cmbright}\Huge\$ by 3 will give you x. So the correct method is to subtract 9, and then multiply by 3.