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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
27000/281 = 9000/x // - 9000/x
27000/281-(9000/x) = 0
27000/281-9000*x^-1 = 0
-9000*x^-1 = -27000/281 // : -9000
x^-1 = 3/281
-1 < 0
1/(x^1) = 3/281 // * x^1
1 = 3/281*x^1 // : 3/281
281/3 = x^1
x = 281/3
x = 281/3
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