Here's why:

* Equal and Opposite Forces: When two forces act on an object in opposite directions with equal magnitudes, they cancel each other out.

* Net Force: Net force is the overall force acting on an object. It's calculated by considering the magnitude and direction of all forces acting on the object.

In this case, the 80 Newtons to the right and 80 Newtons to the left perfectly balance each other, resulting in a net force of zero.