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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
4-(-6/(x^2))-4 = 0
6*x^-2-4+4 = 0
6*x^-2 = 0 // : 6
x^-2 = 0
x należy do O
x belongs to the empty set
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