Incorrect. Isolating the variable requires performing the inverse of each operation in the correct order. Multiplying by three will give you x + 27, which is a good first step. However, subtracting 9 will result in x + 18, and does not isolate the variable. Although you multiplied $\displaystyle\frac{{1}}{{3}}{x}\usepackage{cmbright}\Huge\$ by 3, you probably forgot to multiply 9 by 3. The inverse of +9 is -9, so you need to subtract 9, which willl result in $\displaystyle\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ x. The inverse of dividing by 3 is multiplying by 3, so multiplying $\displaystyle\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ x by 3 will give you x. So the correct method is to subtract 9, and then multiply by 3.