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u in (-oo:+oo)
40 = (4/5)*u // - (4/5)*u
40-((4/5)*u) = 0
(-4/5)*u+40 = 0
40-4/5*u = 0 // - 40
-4/5*u = -40 // : -4/5
u = -40/(-4/5)
u = 50
u = 50
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