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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-x-(2/5)-5 = 0
x/x-x-2/5-5 = 0
-x-22/5 = 0 // + 22/5
-x = 22/5 // * -1
x = -22/5
x = -22/5
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