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w in (-oo:+oo)
4*w = 8/9 // - 8/9
4*w-(8/9) = 0
4*w-8/9 = 0
4*w-8/9 = 0 // + 8/9
4*w = 8/9 // : 4
w = 8/9/4
w = 2/9
w = 2/9
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