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u in (-oo:+oo)
30 = (-5/2)*u // - (-5/2)*u
30-((-5/2)*u) = 0
(5/2)*u+30 = 0
5/2*u+30 = 0 // - 30
5/2*u = -30 // : 5/2
u = -30/5/2
u = -12
u = -12
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