An organism that obtains energy by eating both plants and animals

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.

: -)

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.