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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9-((2*x)/x) = x // - x
9-x-((2*x)/x) = 0
9-x-2 = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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