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v in (-oo:+oo)
-18 = v/2-6 // - v/2-6
6-(v/2)-18 = 0
-1/2*v-12 = 0 // + 12
-1/2*v = 12 // : -1/2
v = 12/(-1/2)
v = -24
v = -24
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