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u in (-oo:+oo)
49 = (-7/6)*u // - (-7/6)*u
49-((-7/6)*u) = 0
(7/6)*u+49 = 0
7/6*u+49 = 0 // - 49
7/6*u = -49 // : 7/6
u = -49/7/6
u = -42
u = -42
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