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c in (-oo:+oo)
(c^3)/3+2*5 = (c^3)/(2+15)+10 // - (c^3)/(2+15)+10
(c^3)/3-((c^3)/(2+15))+2*5-10 = 0
14/51*c^3 = 0 // : 14/51
c^3 = 0
c = 0
c = 0
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