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v in (-oo:+oo)
(-2/5)*v+1/3 = -3*v-(6/5) // + -3*v-(6/5)
(-2/5)*v-(-3*v)+1/3+6/5 = 0
(-2/5)*v+3*v+1/3+6/5 = 0
13/5*v+23/15 = 0 // - 23/15
13/5*v = -23/15 // : 13/5
v = -23/15/13/5
v = -23/39
v = -23/39
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