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D( X )
5*X = 0
5*X = 0
5*X = 0
5*X = 0 // : 5
X = 0
X in (-oo:0) U (0:+oo)
5000/(5*X) = 250 // - 250
5000/(5*X)-250 = 0
1000*X^-1 = 250 // : 1000
X^-1 = 1/4
-1 < 0
1/(X^1) = 1/4 // * X^1
1 = 1/4*X^1 // : 1/4
4 = X^1
X = 4
X = 4
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