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w in (-oo:+oo)
(1/4)*(8*w-7) = 0
1/4*(8*w-7) = 0
( 1/4 )
1/4 = 0
w belongs to the empty set
( 8*w-7 )
8*w-7 = 0 // + 7
8*w = 7 // : 8
w = 7/8
w = 7/8
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