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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+4/x+3+5 = 0
9*x^-1 = -8 // : 9
x^-1 = -8/9
-1 < 0
1/(x^1) = -8/9 // * x^1
1 = -8/9*x^1 // : -8/9
-9/8 = x^1
x = -9/8
x = -9/8
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