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u in (-oo:+oo)
18 = (-6/7)*u // - (-6/7)*u
18-((-6/7)*u) = 0
(6/7)*u+18 = 0
6/7*u+18 = 0 // - 18
6/7*u = -18 // : 6/7
u = -18/6/7
u = -21
u = -21
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