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u in (-oo:+oo)
35 = (5/2)*u // - (5/2)*u
35-((5/2)*u) = 0
(-5/2)*u+35 = 0
35-5/2*u = 0 // - 35
-5/2*u = -35 // : -5/2
u = -35/(-5/2)
u = 14
u = 14
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