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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+1+2 = 2/x+10 // - 2/x+10
1/x+1/x-(2/x)-10+1+2 = 0
1/x+1/x-2*x^-1-10+1+2 = 0
-7 = 0
x belongs to the empty set
x belongs to the empty set
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