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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11000/x = 3.5 // - 3.5
11000/x-3.5 = 0
11000*x^-1 = 3.5 // : 11000
x^-1 = 0.00031818
-1 < 0
1/(x^1) = 0.00031818 // * x^1
1 = 0.00031818*x^1 // : 0.00031818
3142.87510214 = x^1
x = 3142.87510214
x = 3142.87510214
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