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 + 7a = -8a + x + 9 for a in terms of x.
| -\(\frac{1}{2}\)x + \(\frac{3}{4}\) | |
| -\(\frac{1}{5}\)x - \(\frac{2}{5}\) | |
| \(\frac{3}{7}\)x - \(\frac{9}{14}\) | |
| x - 3 |