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u in (-oo:+oo)
50 = (5/2)*u // - (5/2)*u
50-((5/2)*u) = 0
(-5/2)*u+50 = 0
50-5/2*u = 0 // - 50
-5/2*u = -50 // : -5/2
u = -50/(-5/2)
u = 20
u = 20
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