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D( x )
x^2-6 = 0
x^2-6 = 0
x^2-6 = 0
1*x^2 = 6 // : 1
x^2 = 6
x^2 = 6 // ^ 1/2
abs(x) = 6^(1/2)
x = 6^(1/2) or x = -6^(1/2)
x in (-oo:-6^(1/2)) U (-6^(1/2):6^(1/2)) U (6^(1/2):+oo)
0 = (x^2-64)/(x^2-6) // - (x^2-64)/(x^2-6)
0-((x^2-64)/(x^2-6)) = 0
-((x^2-64)/(x^2-6)) = 0
(-1*(x^2-64))/(x^2-6) = 0
( -1 )
-1 = 0
x belongs to the empty set
( x^2-64 )
1*x^2 = 64 // : 1
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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