64-(3n+8n+n):40=37
(3n+8n+n)/40=64-37
12n/40=27
12n=27*40
12n=1080
n=1080/12
n=90
проверка
64-(3*90+8*90+90):40=37
64-(270+720+90)/40=37
64-1080/40=37
64-27=37
37=37
12n=(64-37)*40
64-(3*90+8*90+90):40=64-1080:40=64-27=37
64-(3n+8n+n):40=37
(3n+8n+n)/40=64-37
12n/40=27
12n=27*40
12n=1080
n=1080/12
n=90
проверка
64-(3*90+8*90+90):40=37
64-(270+720+90)/40=37
64-1080/40=37
64-27=37
37=37
64-(3n+8n+n):40=37
12n=(64-37)*40
12n=1080
n=90
64-(3*90+8*90+90):40=64-1080:40=64-27=37