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v in (-oo:+oo)
(-3/2)*v-3 = (3/5)*v-(4/5) // - (3/5)*v-(4/5)
(-3/2)*v-((3/5)*v)+4/5-3 = 0
(-3/2)*v+(-3/5)*v+4/5-3 = 0
-21/10*v-11/5 = 0 // + 11/5
-21/10*v = 11/5 // : -21/10
v = 11/5/(-21/10)
v = -22/21
v = -22/21
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