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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3106/x = 8471/5 // - 8471/5
3106/x-(8471/5) = 0
3106/x-8471/5 = 0
3106*x^-1 = 8471/5 // : 3106
x^-1 = 8471/15530
-1 < 0
1/(x^1) = 8471/15530 // * x^1
1 = 8471/15530*x^1 // : 8471/15530
15530/8471 = x^1
x = 15530/8471
x = 15530/8471
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