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