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w in (-oo:+oo)
-12 = (2/9)*w // - (2/9)*w
-((2/9)*w)-12 = 0
(-2/9)*w-12 = 0
-2/9*w-12 = 0 // + 12
-2/9*w = 12 // : -2/9
w = 12/(-2/9)
w = -54
w = -54
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