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