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c in (-oo:+oo)
(c*c*c)/3+10 = (c*c*c)/13 // - (c*c*c)/13
(c*c*c)/3-((c*c*c)/13)+10 = 0
(c*c*c)/3+(-1/13)*c^3+10 = 0
10/39*c^3 = -10 // : 10/39
c^3 = -39
c^3 = -39 // ^ 1/3
c = -39^(1/3)
c = -39^(1/3)
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