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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
52 = 67/x // - 67/x
52-(67/x) = 0
52-67*x^-1 = 0
-67*x^-1 = -52 // : -67
x^-1 = 52/67
-1 < 0
1/(x^1) = 52/67 // * x^1
1 = 52/67*x^1 // : 52/67
67/52 = x^1
x = 67/52
x = 67/52
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