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w in (-oo:+oo)
(1/4)*w = 1/8 // - 1/8
(1/4)*w-(1/8) = 0
(1/4)*w-1/8 = 0
1/4*w-1/8 = 0 // + 1/8
1/4*w = 1/8 // : 1/4
w = 1/8/1/4
w = 1/2
w = 1/2
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