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