x − 534 = 78
x = 78 + 534
$\snippet{name: op_column, sign: '+', x: '534', y: '78', z: '612'}$
x = 612
 
182 + x = 250
x = 250 − 182
$\snippet{name: op_column, sign: '-', x: '250', y: '182', z: '68'}$
x = 68
 
304 − x = 26
x = 304 − 26
$\snippet{name: op_column, sign: '-', x: '304', y: '26', z: '278'}$
x = 278