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