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D( x )
x^3*x^4 = 0
x^3*x^4 = 0
x^3*x^4 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
x = (x^1*x^2)/(x^3*x^4) // - (x^1*x^2)/(x^3*x^4)
x-((x^1*x^2)/(x^3*x^4)) = 0
x-x^-4 = 0
x-x^-4 = 0
x*(1-x^-5) = 0
-1*x^-5 = -1 // : -1
x^-5 = 1
-5 < 0
1/(x^5) = 1 // * x^5
1 = 1*x^5 // : 1
1 = x^5
x^5 = 1 // ^ 1/5
x = 1
x = 0
x = 0
x in { 0}
x = 1
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