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u in (-oo:+oo)
10 = (2/5)*u // - (2/5)*u
10-((2/5)*u) = 0
(-2/5)*u+10 = 0
10-2/5*u = 0 // - 10
-2/5*u = -10 // : -2/5
u = -10/(-2/5)
u = 25
u = 25
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