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w in (-oo:+oo)
(2/3)*(6*w-18) = 12 // - 12
(2/3)*(6*w-18)-12 = 0
2/3*(6*w-18)-12 = 0
2/3*(6*w-18)-12 = 0
4*w-24 = 0
4*w-24 = 0
4*w-24 = 0 // + 24
4*w = 24 // : 4
w = 24/4
w = 6
w = 6
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