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w in (-oo:+oo)
9-(6*w) = 63/11 // - 63/11
9-(6*w)-(63/11) = 0
9-6*w-63/11 = 0
36/11-6*w = 0 // - 36/11
-6*w = -36/11 // : -6
w = -36/11/(-6)
w = 6/11
w = 6/11
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