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u in (-oo:+oo)
-49 = (-7/2)*u // - (-7/2)*u
-((-7/2)*u)-49 = 0
(7/2)*u-49 = 0
7/2*u-49 = 0 // + 49
7/2*u = 49 // : 7/2
u = 49/7/2
u = 14
u = 14
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