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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-((2/2)*x)+1+2 = 1/5 // - 1/5
x/x-((2/2)*x)-(1/5)+1+2 = 0
x/x-x-1/5+1+2 = 0
19/5-x = 0 // - 19/5
-x = -19/5 // * -1
x = 19/5
x = 19/5
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