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D( x )
(6/5)*x = 0
(6/5)*x = 0
(6/5)*x = 0
6/5*x = 0 // : 6/5
x = 0
x in (-oo:0) U (0:+oo)
-12/((6/5)*x) = 0
-10*x^-1 = 0 // : -10
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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