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