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The opposite of 13 is -13.
The opposite of -(-2) (2) is -2
The opposite of -11 is 11.
l27l=27
l-59l=59
-l59l=-59
4+5=9
-4+(-5)=-4-5=-9
4+(-5)=4-5=-1
3-6=-3
3-(-6)=3+6=9
-3-(-6)=-3+6=3