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w in (-oo:+oo)
12 = (2/3)*w // - (2/3)*w
12-((2/3)*w) = 0
(-2/3)*w+12 = 0
12-2/3*w = 0 // - 12
-2/3*w = -12 // : -2/3
w = -12/(-2/3)
w = 18
w = 18
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