x − 358 = 510
x = 510 + 358
x = 868
$\snippet{name: op_column, sign: '+', x: 510, y: 358, z: 868}$
 
x + 502 = 934
x = 934 − 502
x = 432
$\snippet{name: op_column, sign: '-', x: 934, y: 502, z: 432}$
 
846 − x = 13
x = 846 − 13
x = 833
$\snippet{name: op_column, sign: '-', x: 846, y: 13, z: 833}$