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D( x )
3-x = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:+oo)
((X^2)/(3-x))*(2-x) = 4 // - 4
((X^2)/(3-x))*(2-x)-4 = 0
(X^2*(2-x))/(3-x)-4 = 0
(X^2*(2-x))/(3-x)+(-4*(3-x))/(3-x) = 0
X^2*(2-x)-4*(3-x) = 0
2*X^2-(X^2*x)+4*x-12 = 0
(2*X^2-(X^2*x)+4*x-12)/(3-x) = 0
(2*X^2-(X^2*x)+4*x-12)/(3-x) = 0 // * 3-x
2*X^2-(X^2*x)+4*x-12 = 0
2*X^2+4*x-12 = 0 // - 2*X^2-12
4*x = -(2*X^2-12) // : 4
x = (-(2*X^2-12))/4
x = (12-(2*X^2))/4
x = (12-(2*X^2))/4
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