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d in (-oo:+oo)
(d/31)/2+1/3 = -2/5 // + -2/5
(d/31)/2+1/3-(-2/5) = 0
(d/31)/2+1/3+2/5 = 0
1/62*d+11/15 = 0 // - 11/15
1/62*d = -11/15 // : 1/62
d = -11/15/1/62
d = -682/15
d = -682/15
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