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D( x )
((2*x)/3)*y = 0
((2*x)/3)*y = 0
((2*x)/3)*y = 0
2/3*x*y = 0 // : 2/3*y
x = 0
x in (-oo:0) U (0:+oo)
((x/5)*y)/(((2*x)/3)*y) = 0
3/10 = 0
x belongs to the empty set
x belongs to the empty set
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