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