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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
900/23 = 2700/x // - 2700/x
900/23-(2700/x) = 0
900/23-2700*x^-1 = 0
-2700*x^-1 = -900/23 // : -2700
x^-1 = 1/69
-1 < 0
1/(x^1) = 1/69 // * x^1
1 = 1/69*x^1 // : 1/69
69 = x^1
x = 69
x = 69
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