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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+3/x-1+2 = -8/5 // + -8/5
2/x+3/x-(-8/5)-1+2 = 0
2/x+3/x+8/5-1+2 = 0
5*x^-1 = -13/5 // : 5
x^-1 = -13/25
-1 < 0
1/(x^1) = -13/25 // * x^1
1 = -13/25*x^1 // : -13/25
-25/13 = x^1
x = -25/13
x = -25/13
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