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