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 -3a - 9a = -4a - x - 7 for a in terms of x.
| \(\frac{1}{2}\)x - \(\frac{1}{4}\) | |
| x + \(\frac{7}{9}\) | |
| x - \(\frac{7}{15}\) | |
| 8x - 7 |