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v in (-oo:+oo)
-v/2 > 1.5 // - 1.5
-v/2-1.5 > 0
-1/2*v-1.5 > 0 // + 1.5
-1/2*v > 1.5 // : -1/2
v < 1.5/(-1/2)
v < -3
v in (-oo:-3)
(-oo:-3)
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