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u in (-oo:+oo)
(10/(-3))*u = -7/12 // + -7/12
(10/(-3))*u-(-7/12) = 0
(10/(-3))*u+7/12 = 0
7/12-10/3*u = 0 // - 7/12
-10/3*u = -7/12 // : -10/3
u = -7/12/(-10/3)
u = 7/40
u = 7/40
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