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 2a - 6a = a + z + 9 for a in terms of z.
| 7z + 9 | |
| \(\frac{2}{3}\)z - 2\(\frac{2}{3}\) | |
| 1\(\frac{3}{5}\)z - 1 | |
| -1\(\frac{1}{3}\)z + \(\frac{1}{6}\) |