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v in (-oo:+oo)
-4 > (2*v)/5 // - (2*v)/5
-((2*v)/5)-4 > 0
(-2/5)*v-4 > 0
-2/5*v-4 > 0 // + 4
-2/5*v > 4 // : -2/5
v < 4/(-2/5)
v < -10
v in (-oo:-10)
(-oo:-10)
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