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w in (-oo:+oo)
12-((1/3)*w) = 2 // - 2
12-((1/3)*w)-2 = 0
(-1/3)*w-2+12 = 0
10-1/3*w = 0 // - 10
-1/3*w = -10 // : -1/3
w = -10/(-1/3)
w = 30
w = 30
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