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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
500/250 = 2.2/x // - 2.2/x
500/250-(2.2/x) = 0
500/250-2.2*x^-1 = 0
-2.2*x^-1 = -2 // : -2.2
x^-1 = 0.90909091
-1 < 0
1/(x^1) = 0.90909091 // * x^1
1 = 0.90909091*x^1 // : 0.90909091
1.1 = x^1
x = 1.1
x = 1.1
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