The magnitude of the force exerted by you on your friend is equal to the magnitude of the force exerted by your friend on you.
The information given to us is the you have a tug-of-war with a friend who is the same size and weight as you are. we both pull as hard as we can, but neither of you seems to be winning. You move a little one way or the other, but mostly you are just at rest (although sweating some). The magnitude of the force exerted by you on your friend is equal to the magnitude of the force exerted by your friend on you. This is because of newton's third law of motion that, forces are always equal and opposite, so when you pull on your friend, they pull back on you with an equal and opposite force. Therefore, both forces are the same.
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