Elaboreaza in spatiul rezervat un plan ce ar include cel putin 4 norme de profilaxie a analizatorului cutanat la om

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.

: -)

we would need to see the picture to answer it

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.