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 + 4c = 9c + 2z + 9 for c in terms of z.
| \(\frac{3}{10}\)z - \(\frac{7}{10}\) | |
| -2\(\frac{3}{8}\)z + \(\frac{3}{4}\) | |
| 1\(\frac{2}{3}\)z + 1\(\frac{1}{6}\) | |
| \(\frac{2}{7}\)z - 1\(\frac{2}{7}\) |