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w in (-oo:+oo)
3-3*w = 12-6*w // - 12-6*w
3-3*w-(-6*w)-12 = 0
6*w-3*w-12+3 = 0
3*w-9 = 0 // + 9
3*w = 9 // : 3
w = 9/3
w = 3
w = 3
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