verify that -x(-x) is the same as x for... x=13/17
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-x(-x)=x
-(+13/17)(-+13/17)=13/17
-13/17-13/17=13/17
13/17=13/17
Its verified
-(+13/17)(-+13/17)=13/17
-13/17-13/17=13/17
13/17=13/17
Its verified
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