verify that -(x+y) = (-x) + (-y) when x = -3/4 , y = -6/7
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(-x) + (-y)= -3/4, -6/7
-3/4 + (-6/7)
-3/4- 6/7
-21/28 - 24/28
-45/28
-3/4 + (-6/7)
-3/4- 6/7
-21/28 - 24/28
-45/28
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