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u in (-oo:+oo)
30 = (3/5)*u // - (3/5)*u
30-((3/5)*u) = 0
(-3/5)*u+30 = 0
30-3/5*u = 0 // - 30
-3/5*u = -30 // : -3/5
u = -30/(-3/5)
u = 50
u = 50
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