Răspuns :
84000→84998←85000
84998→ 85000
90000→90000
90000-85000=5000
Verificare:90000-5000=85000
85000+5000=90000
84998→ 85000
90000→90000
90000-85000=5000
Verificare:90000-5000=85000
85000+5000=90000