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v in (-oo:+oo)
3-((1/2)*v) = 5 // - 5
3-((1/2)*v)-5 = 0
(-1/2)*v-5+3 = 0
-1/2*v-2 = 0 // + 2
-1/2*v = 2 // : -1/2
v = 2/(-1/2)
v = -4
v = -4
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