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d in (-oo:+oo)
d/3+1/3 = 4*d-(1/12) // - 4*d-(1/12)
d/3-(4*d)+1/3+1/12 = 0
d/3-4*d+1/3+1/12 = 0
5/12-11/3*d = 0 // - 5/12
-11/3*d = -5/12 // : -11/3
d = -5/12/(-11/3)
d = 5/44
d = 5/44
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