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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1 = 900/x // - 900/x
0.1-(900/x) = 0
0.1-900*x^-1 = 0
-900*x^-1 = -0.1 // : -900
x^-1 = 0.00011111
-1 < 0
1/(x^1) = 0.00011111 // * x^1
1 = 0.00011111*x^1 // : 0.00011111
9000.0900009 = x^1
x = 9000.0900009
x = 9000.0900009
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