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v in (-oo:+oo)
(3/2)*(v+7) = 5/2-v // - 5/2-v
(3/2)*(v+7)+v-(5/2) = 0
(3/2)*(v+7)+v-5/2 = 0
3/2*(v+7)+v-5/2 = 0
(3/2*2*(v+7))/2+(2*v)/2-5/2 = 0
3/2*2*(v+7)+2*v-5 = 0
5*v-5+21 = 0
5*v+16 = 0
(5*v+16)/2 = 0
(5*v+16)/2 = 0 // * 2
5*v+16 = 0
5*v+16 = 0 // - 16
5*v = -16 // : 5
v = -16/5
v = -16/5
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