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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1250/3 = 1875/x // - 1875/x
1250/3-(1875/x) = 0
1250/3-1875*x^-1 = 0
-1875*x^-1 = -1250/3 // : -1875
x^-1 = 2/9
-1 < 0
1/(x^1) = 2/9 // * x^1
1 = 2/9*x^1 // : 2/9
9/2 = x^1
x = 9/2
x = 9/2
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