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