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D( a )
a = 0
(5*a)/a-5 = 0
a = 0
a = 0
(5*a)/a-5 = 0
(5*a)/a-5 = 0
0 = 0
a naleu017Cy do R
a belongs to the empty set
5*a-(a*((7/((5*a)/a-5))/10)) = 0
a belongs to the empty set
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