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v in (-oo:+oo)
1-((3/4)*(v+2)) = 12 // - 12
1-((3/4)*(v+2))-12 = 0
(-3/4)*(v+2)-12+1 = 0
1-3/4*(v+2)-12 = 0
1-3/4*(v+2)-12 = 0
1-3/4*v-27/2 = 0
-3/4*v-25/2 = 0
-3/4*v-25/2 = 0
-3/4*v-25/2 = 0 // + 25/2
-3/4*v = 25/2 // : -3/4
v = 25/2/(-3/4)
v = -50/3
v = -50/3
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