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d in (-oo:+oo)
d/18 = 4/6 // - 4/6
d/18-(4/6) = 0
d/18-2/3 = 0
1/18*d-2/3 = 0 // + 2/3
1/18*d = 2/3 // : 1/18
d = 2/3/1/18
d = 12
d = 12
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