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