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w in (-oo:+oo)
9-w = 6*w-33 // - 6*w-33
9-w-(6*w)+33 = 0
9-w-6*w+33 = 0
42-7*w = 0 // - 42
-7*w = -42 // : -7
w = -42/(-7)
w = 6
w = 6
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