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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
2 = 30/A // - 30/A
2-(30/A) = 0
2-30*A^-1 = 0
-30*A^-1 = -2 // : -30
A^-1 = 1/15
-1 < 0
1/(A^1) = 1/15 // * A^1
1 = 1/15*A^1 // : 1/15
15 = A^1
A = 15
A = 15
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