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w in (-oo:+oo)
(2/7)*w+1/3 = 43/21 // - 43/21
(2/7)*w+1/3-(43/21) = 0
(2/7)*w+1/3-43/21 = 0
2/7*w-12/7 = 0 // + 12/7
2/7*w = 12/7 // : 2/7
w = 12/7/2/7
w = 6
w = 6
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