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w in (-oo:+oo)
w-(2*w)-2/7 = 3/7 // - 3/7
w-(2*w)-2/7-(3/7) = 0
w-2*w-2/7-3/7 = 0
-w-5/7 = 0 // + 5/7
-w = 5/7 // * -1
w = -5/7
w = -5/7
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