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v in (-oo:+oo)
5 = (1/2)*v-3 // - (1/2)*v-3
3-((1/2)*v)+5 = 0
(-1/2)*v+3+5 = 0
8-1/2*v = 0 // - 8
-1/2*v = -8 // : -1/2
v = -8/(-1/2)
v = 16
v = 16
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