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w in (-oo:+oo)
3/8-(2*w) = -1/8 // + -1/8
3/8-(2*w)-(-1/8) = 0
3/8-2*w+1/8 = 0
1/2-2*w = 0 // - 1/2
-2*w = -1/2 // : -2
w = -1/2/(-2)
w = 1/4
w = 1/4
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