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u in (-oo:+oo)
5 = (1/5)*u // - (1/5)*u
5-((1/5)*u) = 0
(-1/5)*u+5 = 0
5-1/5*u = 0 // - 5
-1/5*u = -5 // : -1/5
u = -5/(-1/5)
u = 25
u = 25
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