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v in (-oo:+oo)
(-1/3)*v > 2 // - 2
(-1/3)*v-2 > 0
-1/3*v-2 > 0 // + 2
-1/3*v > 2 // : -1/3
v < 2/(-1/3)
v < -6
v in (-oo:-6)
(-oo:-6)
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