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w in (-oo:+oo)
3*(2-(2*w)) = -36 // + 36
3*(2-(2*w))+36 = 0
3*(2-2*w)+36 = 0
3*(2-2*w)+36 = 0
42-6*w = 0
42-6*w = 0
42-6*w = 0 // - 42
-6*w = -42 // : -6
w = -42/(-6)
w = 7
w = 7
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