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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
32/A = 30/7 // - 30/7
32/A-(30/7) = 0
32/A-30/7 = 0
32*A^-1 = 30/7 // : 32
A^-1 = 15/112
-1 < 0
1/(A^1) = 15/112 // * A^1
1 = 15/112*A^1 // : 15/112
112/15 = A^1
A = 112/15
A = 112/15
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