What is -(-3) opposite

Mathematics
Tutor: None Selected Time limit: 1 Day

I do not understand what the () mean and what opposite mean

Dec 2nd, 2014

the () here is to emphasis the number is -3. So the opposite of -3 is 3.

Dec 2nd, 2014

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Dec 2nd, 2014
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Dec 2nd, 2014
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