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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
53 = 8/x // - 8/x
53-(8/x) = 0
53-8*x^-1 = 0
-8*x^-1 = -53 // : -8
x^-1 = 53/8
-1 < 0
1/(x^1) = 53/8 // * x^1
1 = 53/8*x^1 // : 53/8
8/53 = x^1
x = 8/53
x = 8/53
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