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w in (-oo:+oo)
5/6 = w+5/7 // - w+5/7
5/6-w-(5/7) = 0
5/6-w-5/7 = 0
5/42-w = 0 // - 5/42
-w = -5/42 // * -1
w = 5/42
w = 5/42
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