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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
521/16 = 64/x // - 64/x
521/16-(64/x) = 0
521/16-64*x^-1 = 0
-64*x^-1 = -521/16 // : -64
x^-1 = 521/1024
-1 < 0
1/(x^1) = 521/1024 // * x^1
1 = 521/1024*x^1 // : 521/1024
1024/521 = x^1
x = 1024/521
x = 1024/521
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