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w in (-oo:+oo)
w+w-(5/6)+5/7 = 4/21 // - 4/21
w+w-(5/6)+5/7-(4/21) = 0
w+w-5/6+5/7-4/21 = 0
2*w-13/42 = 0 // + 13/42
2*w = 13/42 // : 2
w = 13/42/2
w = 13/84
w = 13/84
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