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d in (-oo:+oo)
17/18 = d+4/9 // - d+4/9
17/18-d-(4/9) = 0
17/18-d-4/9 = 0
1/2-d = 0 // - 1/2
-d = -1/2 // * -1
d = 1/2
d = 1/2
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