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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2600 = 64386000*(1100/x) // - 64386000*(1100/x)
2600-(64386000*(1100/x)) = 0
2600-70824600000*x^-1 = 0
-70824600000*x^-1 = -2600 // : -70824600000
x^-1 = 13/354123000
-1 < 0
1/(x^1) = 13/354123000 // * x^1
1 = 13/354123000*x^1 // : 13/354123000
354123000/13 = x^1
x = 354123000/13
x = 354123000/13
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