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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-(3/x)+6+6 = (5*x)/(x^2)-36 // - (5*x)/(x^2)-36
5/x-(3/x)-((5*x)/(x^2))+6+6+36 = 0
5/x-3*x^-1-5*x^-1+6+6+36 = 0
-3*x^-1 = -48 // : -3
x^-1 = 16
-1 < 0
1/(x^1) = 16 // * x^1
1 = 16*x^1 // : 16
1/16 = x^1
x = 1/16
x = 1/16
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