5(a+c)+2b, daca a+2b=44si7a+6b+5c=200

Răspuns :

a+2b=44 /x2  => 2a+4b=88

(7a+6b+5c) - (2a+4b)=200-88
5a+5c+2b=112
5(a+c)+2b=112