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w in (-oo:+oo)
4*w-(5*w)+7/9 = -1/18 // + -1/18
4*w-(5*w)+7/9-(-1/18) = 0
4*w-5*w+7/9+1/18 = 0
5/6-w = 0 // - 5/6
-w = -5/6 // * -1
w = 5/6
w = 5/6
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