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v in (-oo:+oo)
(3*v+2)/2-((-v-1)/6) = 0
(3*v+2)/2+(-1*(-v-1))/6 = 0
(6*(3*v+2))/(2*6)+(-1*2*(-v-1))/(2*6) = 0
6*(3*v+2)-1*2*(-v-1) = 0
20*v+14 = 0
(20*v+14)/(2*6) = 0
(20*v+14)/(2*6) = 0 // * 2*6
20*v+14 = 0
20*v+14 = 0 // - 14
20*v = -14 // : 20
v = -14/20
v = -7/10
v = -7/10
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