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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
200 = 1300/x // - 1300/x
200-(1300/x) = 0
200-1300*x^-1 = 0
-1300*x^-1 = -200 // : -1300
x^-1 = 2/13
-1 < 0
1/(x^1) = 2/13 // * x^1
1 = 2/13*x^1 // : 2/13
13/2 = x^1
x = 13/2
x = 13/2
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