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 4a - 9a = 7a - 8x - 9 for a in terms of x.
| 6x - 3 | |
| -\(\frac{1}{3}\)x - 1\(\frac{1}{3}\) | |
| -10x + 8 | |
| -\(\frac{1}{3}\)x + 3 |