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w in (-oo:+oo)
2/3-w = 1/4 // - 1/4
2/3-w-(1/4) = 0
2/3-w-1/4 = 0
5/12-w = 0 // - 5/12
-w = -5/12 // * -1
w = 5/12
w = 5/12
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