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u in (-oo:+oo)
11 < 1-((4*u)/3) // - 1-((4*u)/3)
(4*u)/3-1+11 < 0
4/3*u+10 < 0 // - 10
4/3*u < -10 // : 4/3
u < -10/4/3
u < -15/2
u in (-oo:-15/2)
(-oo:-15/2)
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