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v in (-oo:+oo)
-v/5 < 2.8 // - 2.8
-v/5-2.8 < 0
-1/5*v-2.8 < 0 // + 2.8
-1/5*v < 2.8 // : -1/5
v > 2.8/(-1/5)
v > -14
v in (-14:+oo)
(-14:+oo)
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