+22
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negative means opposite therefore -(-21) = 21 so your answer is 21
Negative in English terms means "opposite." Multiplication can represent "of". So, negative times negative is the "opposite of the opposite." And the opposite of an opposite is the same, hence positive, because "same" is the opposite of "opposite" and positive is the opposite of negative. So if you put it into English words, it actually makes some sense. In essence, negative and negative "cancel out."
A question like this is usually referring to the number line. The opposite of 68 would be -68, on the negative side of the number line.
The question is somewhat ambiguous since you do not define "opposite". If what you are asking is: is the negative of a negative sometimes negative, the answer is: No, never.
The opposite of opposite is same, like or similar. A double negative leads to the original identity of the term. So the answer is same or identical.