If the forces are equal, at a distance equidistant it is not possible to act a pair on the body since both torques cancel each other. Being of the same magnitude and in the opposite direction, the sum of the torques will be zero.
Observing is commenting on what you see e.g: It is raining. Inferring is drawing conclusions from observations for example you see the road is wet so you might infer that it rained last night.
