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