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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
250/x = 3/4 // - 3/4
250/x-(3/4) = 0
250/x-3/4 = 0
250*x^-1 = 3/4 // : 250
x^-1 = 3/1000
-1 < 0
1/(x^1) = 3/1000 // * x^1
1 = 3/1000*x^1 // : 3/1000
1000/3 = x^1
x = 1000/3
x = 1000/3
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