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v in (-oo:+oo)
12 < (-9/4)*v // - (-9/4)*v
12-((-9/4)*v) < 0
(9/4)*v+12 < 0
9/4*v+12 < 0 // - 12
9/4*v < -12 // : 9/4
v < -12/9/4
v < -16/3
v in (-oo:-16/3)
(-oo:-16/3)
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