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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16*x^7 = (4*x^6)/x // - (4*x^6)/x
16*x^7-((4*x^6)/x) = 0
16*x^7-4*x^5 = 0
16*x^7-4*x^5 = 0
4*x^5*(4*x^2-1) = 0
4*x^2 = 1 // : 4
x^2 = 1/4
x^2 = 1/4 // ^ 1/2
abs(x) = 1/2
x = 1/2 or x = -1/2
4*x^5 = 0
4*x^5 = 0 // : 4
x^5 = 0
x = 0
x in { 0}
x in { 1/2, -1/2 }
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