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