What are the three types of posttranscriptional processing?.

thymine. in rna, thymine is replace by uracil

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

nucleus

would be most reasonable answer tbh