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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-(2*x^(-3/5)) = 0
2-2*x^(-3/5) = 0
-2*x^(-3/5) = -2 // : -2
x^(-3/5) = 1
-3/5 < 0
1/(x^(3/5)) = 1 // * x^(3/5)
1 = 1*x^(3/5) // : 1
1 = x^(3/5)
x^(3/5) = 1 // ^ 5
x^3 = 1 // ^ 1/3
x = 1
x = 1
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