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u in (-oo:+oo)
-14 = (-7/5)*u // - (-7/5)*u
-((-7/5)*u)-14 = 0
(7/5)*u-14 = 0
7/5*u-14 = 0 // + 14
7/5*u = 14 // : 7/5
u = 14/7/5
u = 10
u = 10
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