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 - 4a = 8a + 5x - 4 for a in terms of x.
| 9x - 4 | |
| x - 1\(\frac{2}{3}\) | |
| -\(\frac{6}{7}\)x + 1\(\frac{2}{7}\) | |
| -\(\frac{5}{12}\)x + \(\frac{1}{2}\) |