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 3a - a = 9a + 2z - 7 for a in terms of z.
| \(\frac{4}{15}\)z + \(\frac{8}{15}\) | |
| -\(\frac{6}{7}\)z + \(\frac{4}{7}\) | |
| -\(\frac{1}{2}\)z + 1\(\frac{1}{6}\) | |
| -4\(\frac{1}{2}\)z - 1\(\frac{1}{2}\) |