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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^7-((x^5)/(x^3)) = 0
x^7-x^2 = 0
x^7-x^2 = 0
x^2*(x^5-1) = 0
1*x^5 = 1 // : 1
x^5 = 1
x^5 = 1 // ^ 1/5
x = 1
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = 1
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