lol age is nothing xD, i studied that law briefly when i was 12, and now im 15 i studied it in a deeper way, physics class is obligatory for the course im in, and we are obliged to know stuff with precision, i may not know much and i hate being stubborn when im not sure, i hope im not wrong, but i can say im 100% positive on what i said :b The reaction force is represented by a vector, which has the same intensity as the action vector, which also represents a force.
Vectors have 3 characteristics, intensity (or length, or module, same thing); direction, and (not sure if its this way in english) sense.
ive just cleared my mind, according to our school manuals, the direction of the reaction force vector is the same as the action's, which is horizontal, but the sense is different, it takes another way on the same direction, it faces the other way..another sense, therefore not the same vector, so the reaction is not EQUAL to the action, only the reaction's module is equal to the action's module, and also the direction. websites may refer them as equal, if they bear in mind only their scale projection, which is the module, but they have to indicate that.
=)
hope this isnt to confusing xD