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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/100 = 23/x // - 23/x
10/100-(23/x) = 0
10/100-23*x^-1 = 0
-23*x^-1 = -1/10 // : -23
x^-1 = 1/230
-1 < 0
1/(x^1) = 1/230 // * x^1
1 = 1/230*x^1 // : 1/230
230 = x^1
x = 230
x = 230
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