6. For x = 1 /5and y = 3/7 verify that - (x + y) = (- x) + (-y).
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=(1/5+3/7) = (-1/5) + (-3/7)
now take the LCM
=1×7+3×5/35 = -1/5-3/7 or 1/5+3/7
=7+15/35 = 1×7+3×5/35
=22/35 = 7+15/35
=22/35 = 22/35
so (x+y) = (-x)+(-y)
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