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u in (-oo:+oo)
-3*u-(4/3) = (5/2)*u-(5/4) // - (5/2)*u-(5/4)
5/4-3*u-((5/2)*u)-(4/3) = 0
(-5/2)*u-3*u-4/3+5/4 = 0
-11/2*u-1/12 = 0 // + 1/12
-11/2*u = 1/12 // : -11/2
u = 1/12/(-11/2)
u = -1/66
u = -1/66
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