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