x − 96 = 129
x = 129 + 96
$\snippet{name: op_column, sign: '+', x: '129', y: '96', z: '225'}$
x = 225
Проверка:
225 − 96 = 129
129 = 129

x + 377 = 502
x = 502 − 377
$\snippet{name: op_column, sign: '-', x: '502', y: '377', z: '125'}$
x = 125
Проверка:
125 + 377 = 502
502 = 502

546 + x = 712
x = 712 − 546
$\snippet{name: op_column, sign: '-', x: '712', y: '546', z: '166'}$
x = 166
Проверка:
546 + 166 = 712
712 = 712

673 − x = 475
x = 673 − 475
$\snippet{name: op_column, sign: '-', x: '673', y: '475', z: '198'}$
x = 198
Проверка:
673 − 198 = 475
475 = 475