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d in (-oo:+oo)
6/16 = d/12 // - d/12
6/16-(d/12) = 0
3/8-1/12*d = 0 // - 3/8
-1/12*d = -3/8 // : -1/12
d = -3/8/(-1/12)
d = 9/2
d = 9/2
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