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w in (-oo:+oo)
w/9 = 4/6 // - 4/6
w/9-(4/6) = 0
w/9-2/3 = 0
1/9*w-2/3 = 0 // + 2/3
1/9*w = 2/3 // : 1/9
w = 2/3/1/9
w = 6
w = 6
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