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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1250/x = 21 // - 21
1250/x-21 = 0
1250*x^-1 = 21 // : 1250
x^-1 = 21/1250
-1 < 0
1/(x^1) = 21/1250 // * x^1
1 = 21/1250*x^1 // : 21/1250
1250/21 = x^1
x = 1250/21
x = 1250/21
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