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D( x )
(3/5)*x = 0
(3/5)*x = 0
(3/5)*x = 0
3/5*x = 0 // : 3/5
x = 0
x in (-oo:0) U (0:+oo)
((6*y)/10)/((3/5)*x) = 0
x^-1*y = 0 // : y
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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