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u in (-oo:+oo)
25 = (5/3)*u // - (5/3)*u
25-((5/3)*u) = 0
(-5/3)*u+25 = 0
25-5/3*u = 0 // - 25
-5/3*u = -25 // : -5/3
u = -25/(-5/3)
u = 15
u = 15
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