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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
26/6.5 = 34/x // - 34/x
26/6.5-(34/x) = 0
26/6.5-34*x^-1 = 0
-34*x^-1 = -4 // : -34
x^-1 = 2/17
-1 < 0
1/(x^1) = 2/17 // * x^1
1 = 2/17*x^1 // : 2/17
17/2 = x^1
x = 17/2
x = 17/2
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