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 - 6a = -7a + 7z - 7 for a in terms of z.
| 4z + 4 | |
| -\(\frac{1}{2}\)z + \(\frac{4}{7}\) | |
| z - \(\frac{7}{8}\) | |
| 4\(\frac{1}{3}\)z - 2\(\frac{1}{3}\) |