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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.05 = 9000/x // - 9000/x
1.05-(9000/x) = 0
1.05-9000*x^-1 = 0
-9000*x^-1 = -1.05 // : -9000
x^-1 = 0.00011667
-1 < 0
1/(x^1) = 0.00011667 // * x^1
1 = 0.00011667*x^1 // : 0.00011667
8571.18368047 = x^1
x = 8571.18368047
x = 8571.18368047
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