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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8-x = (5*x)/x+1 // - (5*x)/x+1
8-x-((5*x)/x)-1 = 0
8-x-5-1 = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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