Ex 2,vă rog,dau coroana!!!!!!

Răspuns:
a=4b
2×(a-22)=b+5
2a-44=b+5
2a=b+49=>b=2a-49
a=4(2a-49)
a=8a-196
196=7a=>a=196:7=>a=28
b=2×28-49=>b=7
verificare:
2×(28-22)=7+5
12=12 adevarat