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v in (-oo:+oo)
-7/2 < v/8 // - v/8
-(v/8)-7/2 < 0
-1/8*v-7/2 < 0 // + 7/2
-1/8*v < 7/2 // : -1/8
v > 7/2/(-1/8)
v > -28
v in (-28:+oo)
(-28:+oo)
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