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w in (-oo:+oo)
8*((1/4)*w-(3/2)) = 0
8*((1/4)*w-3/2) = 0
8*(1/4*w-3/2) = 0
( 1/4*w-3/2 )
1/4*w-3/2 = 0 // + 3/2
1/4*w = 3/2 // : 1/4
w = 3/2/1/4
w = 6
( 8 )
8 = 0
w belongs to the empty set
w = 6
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