31010 − (5000 − 3774) = 31010 − 1226 = 29784
$\snippet{name: op_column, sign: '-', x: 5000, y: 3774, z: 1226}$
 
$\snippet{name: op_column, sign: '-', x: 31010, y: 1226, z: 29784}$
 
(4000 − 500 : 100) * 10 = (4000 − 5) * 10 = 3995 * 10 = 39950