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