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w in (-oo:+oo)
w+w-(7/9) = 65/9 // - 65/9
w+w-(7/9)-(65/9) = 0
w+w-7/9-65/9 = 0
2*w-8 = 0 // + 8
2*w = 8 // : 2
w = 8/2
w = 4
w = 4
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