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u in (-oo:+oo)
-14 = (-2/7)*u // - (-2/7)*u
-((-2/7)*u)-14 = 0
(2/7)*u-14 = 0
2/7*u-14 = 0 // + 14
2/7*u = 14 // : 2/7
u = 14/2/7
u = 49
u = 49
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