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v in (-oo:+oo)
-3*v-(3/2) = (4/5)*v-(4/5) // - (4/5)*v-(4/5)
4/5-3*v-((4/5)*v)-(3/2) = 0
(-4/5)*v-3*v-3/2+4/5 = 0
-19/5*v-7/10 = 0 // + 7/10
-19/5*v = 7/10 // : -19/5
v = 7/10/(-19/5)
v = -7/38
v = -7/38
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