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