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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(-2*a)/a-2 = 4-(a/a)-2 // - 4-(a/a)-2
(-2*a)/a+a/a-4-2+2 = 0
a/a+(-2*a)/a-4-2+2 = 0
-5 = 0
a belongs to the empty set
a belongs to the empty set
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