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