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w in (-oo:+oo)
2*w+8/9 = 77/36 // - 77/36
2*w+8/9-(77/36) = 0
2*w+8/9-77/36 = 0
2*w-5/4 = 0 // + 5/4
2*w = 5/4 // : 2
w = 5/4/2
w = 5/8
w = 5/8
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