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w in (-oo:+oo)
w+(2/3)*w+9 = 187/18 // - 187/18
w+(2/3)*w-(187/18)+9 = 0
w+(2/3)*w-187/18+9 = 0
5/3*w-25/18 = 0 // + 25/18
5/3*w = 25/18 // : 5/3
w = 25/18/5/3
w = 5/6
w = 5/6
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