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w in (-oo:+oo)
7/12 = w+1/2 // - w+1/2
7/12-w-(1/2) = 0
7/12-w-1/2 = 0
1/12-w = 0 // - 1/12
-w = -1/12 // * -1
w = 1/12
w = 1/12
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