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d in (-oo:+oo)
-1/45 = d+7/9 // - d+7/9
-d-1/45-(7/9) = 0
-d-1/45-7/9 = 0
-d-4/5 = 0 // + 4/5
-d = 4/5 // * -1
d = -4/5
d = -4/5
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