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d in (-oo:+oo)
d/6 = 72/48 // - 72/48
d/6-(72/48) = 0
d/6-3/2 = 0
1/6*d-3/2 = 0 // + 3/2
1/6*d = 3/2 // : 1/6
d = 3/2/1/6
d = 9
d = 9
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