Răspuns :
x-24+5a-10b=69
x-24+5(a-2b)=69
x-24+5*7=69
x-24+35=69
x-24=69-35
x-24=34
x=34+24
x=58
x-24+5(a-2b)=69
x-24+5*7=69
x-24+35=69
x-24=69-35
x-24=34
x=34+24
x=58