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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(6/(-5))+5 = 0
3/x+6/5+5 = 0
3*x^-1 = -31/5 // : 3
x^-1 = -31/15
-1 < 0
1/(x^1) = -31/15 // * x^1
1 = -31/15*x^1 // : -31/15
-15/31 = x^1
x = -15/31
x = -15/31
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