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 6a - 3a = 8a + 8z - 7 for a in terms of z.
| -12z + 7 | |
| \(\frac{12}{13}\)z - \(\frac{8}{13}\) | |
| 1\(\frac{2}{11}\)z - \(\frac{7}{11}\) | |
| -5\(\frac{1}{2}\)z + 3\(\frac{1}{2}\) |