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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
6/8 = 12/A-4 // - 12/A-4
6/8-(12/A)+4 = 0
6/8-12*A^-1+4 = 0
-12*A^-1 = -19/4 // : -12
A^-1 = 19/48
-1 < 0
1/(A^1) = 19/48 // * A^1
1 = 19/48*A^1 // : 19/48
48/19 = A^1
A = 48/19
A = 48/19
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