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