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a in (-oo:+oo)
(-4*((1*5)/(-7)))/8 = a // - a
(-4*((1*5)/(-7)))/8-a = 0
(-4*(5/(-7)))/8-a = 0
5/14-a = 0 // - 5/14
-a = -5/14 // * -1
a = 5/14
a = 5/14
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