You may have tried to subtract $\displaystyle\frac{{1}}{{8}}\usepackage{cmbright}\Huge\$ , instead of multiplying both sides of the equation by 8. Subtracting $\displaystyle\frac{{1}}{{8}}\usepackage{cmbright}\Huge\$ from $\displaystyle{\left(\frac{{1}}{{8}}\right)}{x}\usepackage{cmbright}\Huge\$ will not leave you with x, and you must do the same thing to both sides. The correct answer is $\displaystyle{x}=-{64}\usepackage{cmbright}\Huge\$ .