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u in (-oo:+oo)
-10 = (-2/7)*u // - (-2/7)*u
-((-2/7)*u)-10 = 0
(2/7)*u-10 = 0
2/7*u-10 = 0 // + 10
2/7*u = 10 // : 2/7
u = 10/2/7
u = 35
u = 35
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