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u in (-oo:+oo)
8 = (-4/7)*u // - (-4/7)*u
8-((-4/7)*u) = 0
(4/7)*u+8 = 0
4/7*u+8 = 0 // - 8
4/7*u = -8 // : 4/7
u = -8/4/7
u = -14
u = -14
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