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D( x )
4-x^2 = 0
4-x^2 = 0
4-x^2 = 0
-1*x^2 = -4 // : -1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in (-oo:-2) U (-2:2) U (2:+oo)
5*x*(((5-x)*(6-(3*x)))/(4-x^2)) = 0
5*x*(((5-x)*(6-3*x))/(4-x^2)) = 0
(5*x*(5-x)*(6-3*x))/(4-x^2) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( 5-x )
5-x = 0 // - 5
-x = -5 // * -1
x = 5
( 6-3*x )
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x in { 2}
x in { 0, 5 }
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