Solve the equation 3x + 12 = 0

To solve the equation 3x + 12 = 0, we need to isolate x.

Here are the steps:

1. Subtract 12 from both sides of the equation: 3x + 12 - 12 = 0 - 12 3x = -12
2. Divide both sides of the equation by 3: 3x / 3 = -12 / 3 x = -4

Therefore, the solution to the equation 3x + 12 = 0 is -4.