c) -7-(x+14)-(273-9+381)-(-645-x-20)=
=-7-(x+14)-(264+381)-(-665-x)=
=-7-(x+14)-645+665+x=
=-7-x-14+25+x=
=-21-x+25+x= 4
d)17+(x-4)-(-7+5+x)+(-2+15)-(-4+30)=
=17+(x-4)-(-2+x)+13-26=
=17+x-4+2-x-13=0
Sper că te.am ajutat!
Dacă e bine primesc o coroana?
