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D( x )
((20*m)/3)*x = 0
((20*m)/3)*x = 0
((20*m)/3)*x = 0
20/3*m*x = 0 // : 20/3*m
x = 0
x in (-oo:0) U (0:+oo)
(((15*m)/18)*x)/(((20*m)/3)*x) = 0
1/8 = 0
x belongs to the empty set
x belongs to the empty set
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