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u in (-oo:+oo)
12 < (-9/8)*u // - (-9/8)*u
12-((-9/8)*u) < 0
(9/8)*u+12 < 0
9/8*u+12 < 0 // - 12
9/8*u < -12 // : 9/8
u < -12/9/8
u < -32/3
u in (-oo:-32/3)
(-oo:-32/3)
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