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w in (-oo:+oo)
1/8-((8/9)*w) = 1/9+17/8 // - 1/9+17/8
1/8-((8/9)*w)-(1/9)-(17/8) = 0
(-8/9)*w+1/8-1/9-17/8 = 0
-8/9*w-19/9 = 0 // + 19/9
-8/9*w = 19/9 // : -8/9
w = 19/9/(-8/9)
w = -19/8
w = -19/8
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