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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-(2/x)-8+8 = (5*x)/(x^2)-64 // - (5*x)/(x^2)-64
5/x-(2/x)-((5*x)/(x^2))-8+8+64 = 0
5/x-2*x^-1-5*x^-1-8+8+64 = 0
-2*x^-1 = -64 // : -2
x^-1 = 32
-1 < 0
1/(x^1) = 32 // * x^1
1 = 32*x^1 // : 32
1/32 = x^1
x = 1/32
x = 1/32
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