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c in (-oo:+oo)
(c/13)/3 = 1/3 // - 1/3
(c/13)/3-(1/3) = 0
(c/13)/3-1/3 = 0
1/39*c-1/3 = 0 // + 1/3
1/39*c = 1/3 // : 1/39
c = 1/3/1/39
c = 13
c = 13
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