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v in (-oo:+oo)
(-2/5)*v-3 = (7/3)*v-(1/3) // - (7/3)*v-(1/3)
(-2/5)*v-((7/3)*v)+1/3-3 = 0
(-2/5)*v+(-7/3)*v+1/3-3 = 0
-41/15*v-8/3 = 0 // + 8/3
-41/15*v = 8/3 // : -41/15
v = 8/3/(-41/15)
v = -40/41
v = -40/41
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