x − 214 = 500
x = 500 + 214
x = 714
Проверка:
714 − 214 = 500
500 = 500
 
x + 679 = 836
x = 836 − 679
$\snippet{name: op_column, sign: '-', x: '836', y: '679', z: '157'}$
x = 157
Проверка:
157 + 679 = 836
$\snippet{name: op_column, sign: '+', x: '157', y: '679', z: '836'}$
836 = 836
 
407 − x = 348
x = 407 − 348
$\snippet{name: op_column, sign: '-', x: '407', y: '348', z: '59'}$
x = 59
Проверка:
407 − 59 = 348
$\snippet{name: op_column, sign: '-', x: '407', y: '59', z: '348'}$
348 = 348