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v in (-oo:+oo)
(1/4)*(8-(12*v)) = 0
(1/4)*(8-12*v) = 0
1/4*(8-12*v) = 0
( 1/4 )
1/4 = 0
v belongs to the empty set
( 8-12*v )
8-12*v = 0 // - 8
-12*v = -8 // : -12
v = -8/(-12)
v = 2/3
v = 2/3
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