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 7a + 3a = -7a - 2z - 1 for a in terms of z.
| 6z + 3 | |
| -\(\frac{5}{14}\)z - \(\frac{1}{14}\) | |
| 1\(\frac{1}{6}\)z - \(\frac{1}{4}\) | |
| z + 1 |