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v in (-oo:+oo)
(3*(v+9))/2 = (7*(v-9))/6+7 // - (7*(v-9))/6+7
(3*(v+9))/2-((7*(v-9))/6)-7 = 0
(3*(v+9))/2+(-7/6)*(v-9)-7 = 0
(3*(v+9))/2-7/6*(v-9)-7 = 0
(3*(v+9))/2+(-7/6*2*(v-9))/2+(-7*2)/2 = 0
3*(v+9)-7/6*2*(v-9)-7*2 = 0
2/3*v-14+48 = 0
2/3*v+34 = 0
(2/3*v+34)/2 = 0
(2/3*v+34)/2 = 0 // * 2
2/3*v+34 = 0
2/3*v+34 = 0 // - 34
2/3*v = -34 // : 2/3
v = -34/2/3
v = -51
v = -51
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