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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-2 // - 4-a-2
a+(-2*a)/a-4-2+2 = 0
a-6 = 0 // + 6
a = 6
a = 6
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