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w in (-oo:+oo)
1-(6*w) = 9-4*w // - 9-4*w
1-(6*w)-(-4*w)-9 = 0
4*w-6*w-9+1 = 0
-2*w-8 = 0 // + 8
-2*w = 8 // : -2
w = 8/(-2)
w = -4
w = -4
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