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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x)-4+1 = x+7/x+5 // - x+7/x+5
x-x-(2/x)-(7/x)-5-4+1 = 0
x-x-2*x^-1-7*x^-1-5-4+1 = 0
-9*x^-1 = 8 // : -9
x^-1 = -8/9
-1 < 0
1/(x^1) = -8/9 // * x^1
1 = -8/9*x^1 // : -8/9
-9/8 = x^1
x = -9/8
x = -9/8
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