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w in (-oo:+oo)
w+w-(7/6)+7/7 = 16/21 // - 16/21
w+w-(7/6)+7/7-(16/21) = 0
w+w-7/6+7/7-16/21 = 0
2*w-13/14 = 0 // + 13/14
2*w = 13/14 // : 2
w = 13/14/2
w = 13/28
w = 13/28
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