Incorrect. This would result in $\displaystyle\frac{{1}}{{4}}{x}+{7}\frac{{1}}{{2}}\usepackage{cmbright}\Huge\$ . Isolating the variable requires performing the inverse of the operation in the expression. The inverse of +5 is -5, so you would subtract 5 first. You would then perform the inverse of dividing by 2, which is multiplying by 2. So the correct method is to subtract 5, and then multiply by 2.