Răspuns :
n÷9+17×9-47=111
n÷9+153-47=111
n÷9+106=111 |-106
n÷9=5 | ×9
n=45
verificare
45÷9+153-47=111
5+106=111
111=111
n÷9+153-47=111
n÷9+106=111 |-106
n÷9=5 | ×9
n=45
verificare
45÷9+153-47=111
5+106=111
111=111