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v in (-oo:+oo)
(2/3)*(v-6) = (1/3)*(v+6) // - (1/3)*(v+6)
(2/3)*(v-6)-((1/3)*(v+6)) = 0
(2/3)*(v-6)+(-1/3)*(v+6) = 0
2/3*(v-6)-1/3*(v+6) = 0
2/3*(v-6)-1/3*(v+6) = 0
1/3*v-6 = 0
1/3*v-6 = 0
1/3*v-6 = 0 // + 6
1/3*v = 6 // : 1/3
v = 6/1/3
v = 18
v = 18
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