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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
6/A+8 = 53 // - 53
6/A-53+8 = 0
6*A^-1 = 45 // : 6
A^-1 = 15/2
-1 < 0
1/(A^1) = 15/2 // * A^1
1 = 15/2*A^1 // : 15/2
2/15 = A^1
A = 2/15
A = 2/15
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