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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
67/100 = 100/x // - 100/x
67/100-(100/x) = 0
67/100-100*x^-1 = 0
-100*x^-1 = -67/100 // : -100
x^-1 = 67/10000
-1 < 0
1/(x^1) = 67/10000 // * x^1
1 = 67/10000*x^1 // : 67/10000
10000/67 = x^1
x = 10000/67
x = 10000/67
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