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w in (-oo:+oo)
8 = (2/9)*w // - (2/9)*w
8-((2/9)*w) = 0
(-2/9)*w+8 = 0
8-2/9*w = 0 // - 8
-2/9*w = -8 // : -2/9
w = -8/(-2/9)
w = 36
w = 36
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