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u in (-oo:+oo)
40 = (5/8)*u // - (5/8)*u
40-((5/8)*u) = 0
(-5/8)*u+40 = 0
40-5/8*u = 0 // - 40
-5/8*u = -40 // : -5/8
u = -40/(-5/8)
u = 64
u = 64
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