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w in (-oo:+oo)
6*w-6 = 3*w+21 // - 3*w+21
6*w-(3*w)-21-6 = 0
6*w-3*w-21-6 = 0
3*w-27 = 0 // + 27
3*w = 27 // : 3
w = 27/3
w = 9
w = 9
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