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w in (-oo:+oo)
2/3-5*w = 3*w-(50/9) // - 3*w-(50/9)
2/3-5*w-(3*w)+50/9 = 0
2/3-5*w-3*w+50/9 = 0
56/9-8*w = 0 // - 56/9
-8*w = -56/9 // : -8
w = -56/9/(-8)
w = 7/9
w = 7/9
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