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v in (-oo:+oo)
-6 = v/2-3 // - v/2-3
3-(v/2)-6 = 0
-1/2*v-3 = 0 // + 3
-1/2*v = 3 // : -1/2
v = 3/(-1/2)
v = -6
v = -6
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