How can you find the net force if two forces act in opposite direction?

Newton's third law states that when two bodies interact, the forces are equal and opposite in magnitude (distance and direction).

Explanation:

For example, if a box has 3 Newtons for force pushing to the left, and 3 Newtons pushing to the right, the net force would be zero, because they cancel each other out. But, if there is 3 Newtons pushing left and 2 Newtons pushing right, the net force would be 1 Newton to the left.