Răspuns :
⇒ a,3a+15 nr
3a+15-a=69
2a+15=69
2a=69-15
2a=54
a=54:2
a=27
3a+15=3·27+15=81+15=96
numerele sunt:27,96
verificare:06-27=69
3a+15-a=69
2a+15=69
2a=69-15
2a=54
a=54:2
a=27
3a+15=3·27+15=81+15=96
numerele sunt:27,96
verificare:06-27=69