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w in (-oo:+oo)
(3/4)*(16*w-8) = 0
3/4*(16*w-8) = 0
( 16*w-8 )
16*w-8 = 0 // + 8
16*w = 8 // : 16
w = 8/16
w = 1/2
( 3/4 )
3/4 = 0
w belongs to the empty set
w = 1/2
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