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D( A )
3-A = 0
3-A = 0
3-A = 0
3-A = 0 // - 3
-A = -3 // * -1
A = 3
A in (-oo:3) U (3:+oo)
1/3-(((1/2)/(3-A))/3) = 0
(-1/6)*(3-A)^-1+1/3 = 0
1/3-1/6/(3-A) = 0
(-1/6*3)/(3*(3-A))+(1*(3-A))/(3*(3-A)) = 0
1*(3-A)-1/6*3 = 0
5/2-A = 0
(5/2-A)/(3*(3-A)) = 0
(5/2-A)/(3*(3-A)) = 0 // * 3*(3-A)
5/2-A = 0
5/2-A = 0 // - 5/2
-A = -5/2 // * -1
A = 5/2
A = 5/2
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