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d in (-oo:+oo)
6*d = 18/11 // - 18/11
6*d-(18/11) = 0
6*d-18/11 = 0
6*d-18/11 = 0 // + 18/11
6*d = 18/11 // : 6
d = 18/11/6
d = 3/11
d = 3/11
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