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D( x )
11*x+5 = 0
11*x+5 = 0
11*x+5 = 0
11*x+5 = 0 // - 5
11*x = -5 // : 11
x = -5/11
x in (-oo:-5/11) U (-5/11:+oo)
(9*x+1)/(11*x+5) = 0
9*x+1 = 0 // - 1
9*x = -1 // : 9
x = -1/9
x = -1/9
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