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 a + 2a = -8a + 7z + 7 for a in terms of z.
| -\(\frac{4}{13}\)z - \(\frac{5}{13}\) | |
| \(\frac{3}{10}\)z + \(\frac{7}{10}\) | |
| \(\frac{5}{9}\)z + \(\frac{7}{9}\) | |
| z - \(\frac{2}{5}\) |