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u in (-oo:+oo)
6 = (3/5)*u // - (3/5)*u
6-((3/5)*u) = 0
(-3/5)*u+6 = 0
6-3/5*u = 0 // - 6
-3/5*u = -6 // : -3/5
u = -6/(-3/5)
u = 10
u = 10
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