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D( x )
x^2-29 = 0
x^2-29 = 0
x^2-29 = 0
1*x^2 = 29 // : 1
x^2 = 29
x^2 = 29 // ^ 1/2
abs(x) = 29^(1/2)
x = 29^(1/2) or x = -29^(1/2)
x in (-oo:-29^(1/2)) U (-29^(1/2):29^(1/2)) U (29^(1/2):+oo)
(x-7)/(x^2-29) = 0
x-7 = 0 // + 7
x = 7
x = 7
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