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