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w in (-oo:+oo)
(2*w)/6 = 12/9 // - 12/9
(2*w)/6-(12/9) = 0
(2*w)/6-4/3 = 0
1/3*w-4/3 = 0 // + 4/3
1/3*w = 4/3 // : 1/3
w = 4/3/1/3
w = 4
w = 4
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