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