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 -9a - 8a = -8a - 4x - 7 for a in terms of x.
| -4x + 7 | |
| \(\frac{2}{3}\)x + \(\frac{7}{12}\) | |
| -1\(\frac{4}{7}\)x + \(\frac{2}{7}\) | |
| -\(\frac{1}{9}\)x + \(\frac{7}{9}\) |