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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(X^2-22)/(x-3)+6 = 0
(X^2-22)/(x-3)+(6*(x-3))/(x-3) = 0
6*(x-3)+X^2-22 = 0
X^2+6*x-40 = 0
(X^2+6*x-40)/(x-3) = 0
(X^2+6*x-40)/(x-3) = 0 // * x-3
X^2+6*x-40 = 0
X^2+6*x-40 = 0 // - X^2-40
6*x = -(X^2-40) // : 6
x = (-(X^2-40))/6
x = (40-X^2)/6
x = (40-X^2)/6
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