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v in (-oo:+oo)
-15 = (-3/2)*v // - (-3/2)*v
-((-3/2)*v)-15 = 0
(3/2)*v-15 = 0
3/2*v-15 = 0 // + 15
3/2*v = 15 // : 3/2
v = 15/3/2
v = 10
v = 10
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