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