$71 \overset{2}{+} (360 \overset{1}{-} 124) \overset{3}{-} 298 = 9$
1) $\snippet{name: op_column, sign: '-', x: '360', y: '124', z: '236'}$;
2) $\snippet{name: op_column, sign: '+', x: '71', y: '236', z: '307'}$;
3) $\snippet{name: op_column, sign: '-', x: '307', y: '298', z: '9'}$.
 
$(193 \overset{1}{+} 307) \overset{3}{-} 43 \overset{4}{-} (435 \overset{2}{-} 87) = 109$
1) $\snippet{name: op_column, sign: '+', x: '193', y: '307', z: '500'}$;
2) $\snippet{name: op_column, sign: '-', x: '435', y: '87', z: '348'}$;
3) $\snippet{name: op_column, sign: '-', x: '500', y: '43', z: '457'}$;
4) $\snippet{name: op_column, sign: '-', x: '457', y: '348', z: '109'}$.