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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/38 = 200/x // - 200/x
16/38-(200/x) = 0
16/38-200*x^-1 = 0
-200*x^-1 = -8/19 // : -200
x^-1 = 1/475
-1 < 0
1/(x^1) = 1/475 // * x^1
1 = 1/475*x^1 // : 1/475
475 = x^1
x = 475
x = 475
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