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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
300/x = 0.6 // - 0.6
300/x-0.6 = 0
300*x^-1 = 0.6 // : 300
x^-1 = 0.002
-1 < 0
1/(x^1) = 0.002 // * x^1
1 = 0.002*x^1 // : 0.002
500 = x^1
x = 500
x = 500
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