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