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 + 7a = 9a - 3z + 2 for a in terms of z.
| 1\(\frac{1}{7}\)z - \(\frac{1}{7}\) | |
| -1\(\frac{1}{10}\)z + \(\frac{9}{10}\) | |
| -\(\frac{5}{8}\)z + \(\frac{1}{4}\) | |
| \(\frac{5}{8}\)z - \(\frac{1}{8}\) |