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