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u in (-oo:+oo)
28 = (-7/8)*u // - (-7/8)*u
28-((-7/8)*u) = 0
(7/8)*u+28 = 0
7/8*u+28 = 0 // - 28
7/8*u = -28 // : 7/8
u = -28/7/8
u = -32
u = -32
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