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u in (-oo:+oo)
14 = (-7/8)*u // - (-7/8)*u
14-((-7/8)*u) = 0
(7/8)*u+14 = 0
7/8*u+14 = 0 // - 14
7/8*u = -14 // : 7/8
u = -14/7/8
u = -16
u = -16
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