EL VALOR DE LA VIDA: ES VALOR UNIVERSAL, FUNDAMENTAL, BASICO, INCORRUPTIBLE, INQUEBRANTABLE E INSUSTITUIBLE."

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.

: -)

the correct answer in apex is tissue development, i know because i just had this question

huh

explanation: