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D( a )
a+1 = 0
a+1 = 0
a+1 = 0
a+1 = 0 // - 1
a = -1
a in (-oo:-1) U (-1:+oo)
12/(a+1) = 132/35 // - 132/35
12/(a+1)-(132/35) = 0
12/(a+1)-132/35 = 0
(12*35)/(35*(a+1))+(-132*(a+1))/(35*(a+1)) = 0
12*35-132*(a+1) = 0
288-132*a = 0
(288-132*a)/(35*(a+1)) = 0
(288-132*a)/(35*(a+1)) = 0 // * 35*(a+1)
288-132*a = 0
288-132*a = 0 // - 288
-132*a = -288 // : -132
a = -288/(-132)
a = 24/11
a = 24/11
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