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d in (-oo:+oo)
d/6 = 9/2 // - 9/2
d/6-(9/2) = 0
d/6-9/2 = 0
1/6*d-9/2 = 0 // + 9/2
1/6*d = 9/2 // : 1/6
d = 9/2/1/6
d = 27
d = 27
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