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v in (-oo:+oo)
-18 = (-3/2)*v // - (-3/2)*v
-((-3/2)*v)-18 = 0
(3/2)*v-18 = 0
3/2*v-18 = 0 // + 18
3/2*v = 18 // : 3/2
v = 18/3/2
v = 12
v = 12
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