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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.03/x = 600 // - 600
3.03/x-600 = 0
3.03*x^-1 = 600 // : 3.03
x^-1 = 198.01980198
-1 < 0
1/(x^1) = 198.01980198 // * x^1
1 = 198.01980198*x^1 // : 198.01980198
0.00505 = x^1
x = 0.00505
x = 0.00505
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