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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
500/11 = 55000/x // - 55000/x
500/11-(55000/x) = 0
500/11-55000*x^-1 = 0
-55000*x^-1 = -500/11 // : -55000
x^-1 = 1/1210
-1 < 0
1/(x^1) = 1/1210 // * x^1
1 = 1/1210*x^1 // : 1/1210
1210 = x^1
x = 1210
x = 1210
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