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w in (-oo:+oo)
3*w-(8/9) = 11/18 // - 11/18
3*w-(8/9)-(11/18) = 0
3*w-8/9-11/18 = 0
3*w-3/2 = 0 // + 3/2
3*w = 3/2 // : 3
w = 3/2/3
w = 1/2
w = 1/2
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