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