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