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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)
(7*x-3)/(x-11) = 0
7*x-3 = 0 // + 3
7*x = 3 // : 7
x = 3/7
x = 3/7
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