Уравнение 69-(97-(28+n))=45
69-(97-(28+n))=45 97-(28+n)=69-45 97-(28+n)=24 28+n=97-24 28+n=73 n=73-28 n=45
97-(28+n)=69-45 97-(28+n)=24 28+n=97-24 28+n=73 n=73-28 n=45