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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/400 = 22/x // - 22/x
1/400-(22/x) = 0
1/400-22*x^-1 = 0
-22*x^-1 = -1/400 // : -22
x^-1 = 1/8800
-1 < 0
1/(x^1) = 1/8800 // * x^1
1 = 1/8800*x^1 // : 1/8800
8800 = x^1
x = 8800
x = 8800
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