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w in (-oo:+oo)
3*(6*w+6) = 180 // - 180
3*(6*w+6)-180 = 0
3*(6*w+6)-180 = 0
18*w-162 = 0
18*w-162 = 0
18*w-162 = 0 // + 162
18*w = 162 // : 18
w = 162/18
w = 9
w = 9
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