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v in (-oo:+oo)
(2/5)*v-3 = v/2 // - v/2
(2/5)*v-(v/2)-3 = 0
-1/10*v-3 = 0 // + 3
-1/10*v = 3 // : -1/10
v = 3/(-1/10)
v = -30
v = -30
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