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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-((9*x)/x) = 2*x // - 2*x
5-(2*x)-((9*x)/x) = 0
5-2*x-9 = 0
-2*x-4 = 0 // + 4
-2*x = 4 // : -2
x = 4/(-2)
x = -2
x = -2
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