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w in (-oo:+oo)
2*w-(1/3) = 71/3 // - 71/3
2*w-(1/3)-(71/3) = 0
2*w-1/3-71/3 = 0
2*w-24 = 0 // + 24
2*w = 24 // : 2
w = 24/2
w = 12
w = 12
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