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w in (-oo:+oo)
6/9 = w/12 // - w/12
6/9-(w/12) = 0
2/3-1/12*w = 0 // - 2/3
-1/12*w = -2/3 // : -1/12
w = -2/3/(-1/12)
w = 8
w = 8
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