10106 − (8508 − 3469) = 10106 − 5039 = 5067
$\snippet{name: op_column, sign: '-', x: 8508, y: 3469, z: 5039}$
 
$\snippet{name: op_column, sign: '-', x: 10106, y: 5039, z: 5067}$
 
(1000 + 200) : (20 * 5) = 1200 : 100 = 12