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D( x )
x+11 = 0
x+11 = 0
x+11 = 0
x+11 = 0 // - 11
x = -11
x in (-oo:-11) U (-11:+oo)
(x/(x+11))*(x-11) = 0
(x*(x-11))/(x+11) = 0
( x-11 )
x-11 = 0 // + 11
x = 11
( x )
x = 0
x in { 11, 0 }
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