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