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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/4 = 600/x // - 600/x
5/4-(600/x) = 0
5/4-600*x^-1 = 0
-600*x^-1 = -5/4 // : -600
x^-1 = 1/480
-1 < 0
1/(x^1) = 1/480 // * x^1
1 = 1/480*x^1 // : 1/480
480 = x^1
x = 480
x = 480
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