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w in (-oo:+oo)
(2/7)*w+2/3 = 80/21 // - 80/21
(2/7)*w+2/3-(80/21) = 0
(2/7)*w+2/3-80/21 = 0
2/7*w-22/7 = 0 // + 22/7
2/7*w = 22/7 // : 2/7
w = 22/7/2/7
w = 11
w = 11
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