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u in (-oo:+oo)
-20 = (5/8)*u // - (5/8)*u
-((5/8)*u)-20 = 0
(-5/8)*u-20 = 0
-5/8*u-20 = 0 // + 20
-5/8*u = 20 // : -5/8
u = 20/(-5/8)
u = -32
u = -32
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