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 8a + 7a = 9a - 6z - 6 for a in terms of z.
| 13z + 6 | |
| \(\frac{1}{5}\)z - \(\frac{9}{10}\) | |
| 5\(\frac{1}{3}\)z - 2\(\frac{2}{3}\) | |
| -\(\frac{7}{11}\)z + \(\frac{5}{11}\) |