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 -9a + 2a = 4a - 5z - 7 for a in terms of z.
| 14z + 3 | |
| \(\frac{7}{13}\)z + \(\frac{7}{13}\) | |
| -\(\frac{1}{4}\)z + \(\frac{3}{8}\) | |
| -z + 1\(\frac{1}{8}\) |