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u in (-oo:+oo)
10 = (4/5)*u // - (4/5)*u
10-((4/5)*u) = 0
(-4/5)*u+10 = 0
10-4/5*u = 0 // - 10
-4/5*u = -10 // : -4/5
u = -10/(-4/5)
u = 25/2
u = 25/2
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