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D( x )
x+33 = 0
x+33 = 0
x+33 = 0
x+33 = 0 // - 33
x = -33
x in (-oo:-33) U (-33:+oo)
x/(x+33) = 1 // - 1
x/(x+33)-1 = 0
x/(x+33)+(-1*(x+33))/(x+33) = 0
x-1*(x+33) = 0
-33 = 0
-33/(x+33) = 0
-33/(x+33) = 0 // * x+33
-33 = 0
x belongs to the empty set
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