-(-(-(-(-a)))) = -a
-50=50
9,09 = -9,09
-20 10/13 = 20 10/13
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-(-(-(-(-a)))) = -a
-50=50
9,09 = -9,09
-20 10/13 = 20 10/13
-50=50
9.09=-9.09
-20 10/13=20 10/30