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c in (-oo:+oo)
c^3-((c/2)*c^2)-(6*c) = 0
c^3+(-1/2)*c^3-6*c = 0
1/2*c^3-6*c = 0
c*(1/2*c^2-6) = 0
1/2*c^2 = 6 // : 1/2
c^2 = 12
c^2 = 12 // ^ 1/2
abs(c) = 2*3^(1/2)
c = 2*3^(1/2) or c = -(2*3^(1/2))
c = 0
c = 0
c in { 2*3^(1/2), -(2*3^(1/2)), 0 }
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