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