$(7470 \overset{1}{:} 18 \overset{2}{-} 319) \overset{7}{+} (103 \overset{3}{*} 20 \overset{5}{-} 24 \overset{4}{*} 45) \overset{6}{:} 28 = (415 - 319) + (2060 - 1080) : 28 = 96 + 980 : 28 = 96 + 35 = 131$
1) $\snippet{name: long_division, x: 7470, y: 18}$;
2) $\snippet{name: op_column, sign: '-', x: '415', y: '319', z: '96'}$;
3) ;
4) $\snippet{name: column_multiplication, x: 24, y: 45}$;
5) $\snippet{name: op_column, sign: '-', x: '2060', y: '1080', z: '980'}$;
6) $\snippet{name: long_division, x: 980, y: 28}$;
7) $\snippet{name: op_column, sign: '+', x: '96', y: '35', z: '131'}$.

$21 \overset{4}{*} 55 \overset{5}{+} (107209 \overset{1}{-} 21696) \overset{6}{-} (78 \overset{3}{+} 8664 \overset{2}{:} 76) = 1155 + 85513 - (78 + 114) = 1155 + 85513 - 192 = 86668 - 192 = 86476$
1) $\snippet{name: op_column, sign: '-', x: '107209', y: '21696', z: '85513'}$;
2) $\snippet{name: long_division, x: 8664, y: 76}$;
3) $\snippet{name: op_column, sign: '+', x: '78', y: '114', z: '192'}$;
4) $\snippet{name: column_multiplication, x: 21, y: 55}$;
5) $\snippet{name: op_column, sign: '+', x: '1155', y: '85513', z: '86668'}$;
6) $\snippet{name: op_column, sign: '-', x: '86668', y: '192', z: '86476'}$.

$(900 \overset{2}{-} 654 \overset{1}{:} 6) \overset{5}{*} 7 \overset{7}{+} 6 \overset{6}{*} (571 \overset{4}{-} 24 \overset{3}{*} 23) = (900 - 109) * 7 + 6 * (571 - 552) = 791 * 7 + 6 * 19 = 5537 + 114 = 5651$
1) $\snippet{name: long_division, x: 654, y: 6}$;
2) $\snippet{name: op_column, sign: '-', x: '900', y: '109', z: '791'}$;
3) $\snippet{name: column_multiplication, x: 24, y: 23}$;
4) $\snippet{name: op_column, sign: '-', x: '571', y: '552', z: '19'}$;
5) $\snippet{name: column_multiplication, x: 791, y: 7}$;
6) $\snippet{name: column_multiplication, x: 19, y: 6}$;
7) $\snippet{name: op_column, sign: '+', x: '5537', y: '114', z: '5651'}$.

$(873 \overset{2}{-} 6036 \overset{1}{:} 12) \overset{5}{*} 12 \overset{7}{-} 2 \overset{6}{*} (48 \overset{3}{*} 7 \overset{4}{+} 344) = (873 - 503) * 12 - 2 * (336 + 344) = 370 * 12 - 2 * 680 = 4440 - 1360 = 3080$
1) $\snippet{name: long_division, x: 6036, y: 12}$;
2) $\snippet{name: op_column, sign: '-', x: '873', y: '503', z: '370'}$;
3) $\snippet{name: column_multiplication, x: 48, y: 7}$;
4) $\snippet{name: op_column, sign: '+', x: '336', y: '344', z: '680'}$;
5) ;
6) ;
7) $\snippet{name: op_column, sign: '-', x: '4440', y: '1360', z: '3080'}$.