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 + a = 9a - 2z + 5 for a in terms of z.
| 1\(\frac{1}{2}\)z - 2\(\frac{1}{2}\) | |
| \(\frac{6}{7}\)z - \(\frac{5}{7}\) | |
| -1\(\frac{1}{8}\)z + 1\(\frac{1}{8}\) | |
| -\(\frac{1}{5}\)z - 1\(\frac{4}{5}\) |