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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+6 = 17/x // - 17/x
5/x-(17/x)+6 = 0
5/x-17*x^-1+6 = 0
-12*x^-1 = -6 // : -12
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
x = 2
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