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w in (-oo:+oo)
(1/6)*w-((1/3)*w) = 12 // - 12
(1/6)*w-((1/3)*w)-12 = 0
(1/6)*w+(-1/3)*w-12 = 0
-1/6*w-12 = 0 // + 12
-1/6*w = 12 // : -1/6
w = 12/(-1/6)
w = -72
w = -72
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