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w in (-oo:+oo)
3*(2*w+4) = -18 // + 18
3*(2*w+4)+18 = 0
3*(2*w+4)+18 = 0
6*w+30 = 0
6*w+30 = 0
6*w+30 = 0 // - 30
6*w = -30 // : 6
w = -30/6
w = -5
w = -5
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