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