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v in (-oo:+oo)
(3/8)*v > 3 // - 3
(3/8)*v-3 > 0
3/8*v-3 > 0 // + 3
3/8*v > 3 // : 3/8
v > 3/3/8
v > 8
v in (8:+oo)
(8:+oo)
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