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D( a )
a+2 = 0
a-3 = 0
a+2 = 0
a+2 = 0
a+2 = 0 // - 2
a = -2
a-3 = 0
a-3 = 0
a-3 = 0 // + 3
a = 3
a in (-oo:-2) U (-2:3) U (3:+oo)
(2*a-3)/(a-3)-2 = 12/(a+2) // - 12/(a+2)
(2*a-3)/(a-3)-(12/(a+2))-2 = 0
(2*a-3)/(a-3)-12*(a+2)^-1-2 = 0
(2*a-3)/(a-3)-12/(a+2)-2 = 0
((2*a-3)*(a+2))/((a-3)*(a+2))+(-12*(a-3))/((a-3)*(a+2))+(-2*(a-3)*(a+2))/((a-3)*(a+2)) = 0
(2*a-3)*(a+2)-12*(a-3)-2*(a-3)*(a+2) = 0
2*a^2-2*a^2-11*a+2*a+12+30 = 0
42-9*a = 0
(42-9*a)/((a-3)*(a+2)) = 0
(42-9*a)/((a-3)*(a+2)) = 0 // * (a-3)*(a+2)
42-9*a = 0
42-9*a = 0 // - 42
-9*a = -42 // : -9
a = -42/(-9)
a = 14/3
a = 14/3
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