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u in (-oo:+oo)
-((5/2)*u)-(5/3) = -((1/6)*u)-(7/2) // + -((1/6)*u)-(7/2)
(1/6)*u-((5/2)*u)-(5/3)+7/2 = 0
(-5/2)*u+(1/6)*u-5/3+7/2 = 0
11/6-7/3*u = 0 // - 11/6
-7/3*u = -11/6 // : -7/3
u = -11/6/(-7/3)
u = 11/14
u = 11/14
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