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d in (-oo:+oo)
d/12 = 0.25 // - 0.25
d/12-0.25 = 0
1/12*d-0.25 = 0 // + 0.25
1/12*d = 0.25 // : 1/12
d = 0.25/1/12
d = 3.00000012
d = 3.00000012
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