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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 6/x-(1/2) // - 6/x-(1/2)
1/x-(6/x)+1/2 = 0
1/x-6*x^-1+1/2 = 0
-5*x^-1 = -1/2 // : -5
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x = 10
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