You may have correctly simplified the equation to $\displaystyle-{2}{x}={8}{x}-{14}\usepackage{cmbright}\Huge\$ , and then made a mistake trying to get the like terms together on one side of the equation. You can do that here by subtracting $\displaystyle{8}{x}\usepackage{cmbright}\Huge\$ from both sides of the equation. When you combine the like terms, use the same rules you learned to add positive and negative numbers.