Question

According to Newton’s first law of motion, when will an object at rest begin to move?

Answer 1

Then the two forces acting on the body are equal.

Step-by-step explanation:

Answer 2

Newton's first law of motion says something like "An object remains
in constant, uniform motion until acted on by an external force".

Constant uniform motion means no change in speed or direction.
If an object changes from rest to motion, that's definitely a change
of speed. So it doesn't remain in the state of constant uniform
motion (none) that it had when it was at rest, and that tells us
that an external force must have acted on it.