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u in (-oo:+oo)
-3*u-((1/3)*u) = 1/4-(7/3) // - 1/4-(7/3)
7/3-3*u-((1/3)*u)-(1/4) = 0
(-1/3)*u-3*u-1/4+7/3 = 0
25/12-10/3*u = 0 // - 25/12
-10/3*u = -25/12 // : -10/3
u = -25/12/(-10/3)
u = 5/8
u = 5/8
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