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 + 7a = -6a + 5x + 9 for a in terms of x.
| 2x + 8 | |
| 2\(\frac{2}{5}\)x - \(\frac{2}{5}\) | |
| -\(\frac{2}{7}\)x + 1\(\frac{2}{7}\) | |
| 1\(\frac{5}{6}\)x + \(\frac{1}{6}\) |