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v in (-oo:+oo)
-12 = (-4/3)*v // - (-4/3)*v
-((-4/3)*v)-12 = 0
(4/3)*v-12 = 0
4/3*v-12 = 0 // + 12
4/3*v = 12 // : 4/3
v = 12/4/3
v = 9
v = 9
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