When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
Solve -7a - 5a = -8a - x - 7 for a in terms of x.
| 4x - 7 | |
| x + 1\(\frac{1}{2}\) | |
| \(\frac{1}{3}\)x - 2\(\frac{2}{3}\) | |
| -\(\frac{3}{4}\)x + \(\frac{1}{2}\) |