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u in (-oo:+oo)
56 = (8/7)*u // - (8/7)*u
56-((8/7)*u) = 0
(-8/7)*u+56 = 0
56-8/7*u = 0 // - 56
-8/7*u = -56 // : -8/7
u = -56/(-8/7)
u = 49
u = 49
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