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x in (-oo:+oo)
(3/5)*c = (1/5)*x^10 // - (1/5)*x^10
(3/5)*c-((1/5)*x^10) = 0
(3/5)*c+(-1/5)*x^10 = 0
-1/5*x^10 = -(3/5*c) // : -1/5
x^10 = 3*c
x^10 = 3*c // ^ 1/10
abs(x) = 3^(1/10)*c^(1/10)
x = 3^(1/10)*c^(1/10) or x = -(3^(1/10)*c^(1/10))
x in { 3^(1/10)*c^(1/10), -(3^(1/10)*c^(1/10)) }
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