Solve 4x + 7 = 3x + 12

Step-by-step solution

1. Move all $x$ terms to the left and constants to the right.

2. Subtract $3x$ from both sides: $4x - 3x + 7 = 12$, i.e. $x + 7 = 12$.

3. Subtract $7$ from both sides: $x = 12 - 7 = 5$.