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