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u in (-oo:+oo)
15 = (5/3)*u // - (5/3)*u
15-((5/3)*u) = 0
(-5/3)*u+15 = 0
15-5/3*u = 0 // - 15
-5/3*u = -15 // : -5/3
u = -15/(-5/3)
u = 9
u = 9
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