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w in (-oo:+oo)
(2/3)*w+3/10 = 209/30 // - 209/30
(2/3)*w+3/10-(209/30) = 0
(2/3)*w+3/10-209/30 = 0
2/3*w-20/3 = 0 // + 20/3
2/3*w = 20/3 // : 2/3
w = 20/3/2/3
w = 10
w = 10
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