(y-123)+87=242

y-123=242-87

y-123=154

y=154+123

y=277

(395 + x) − 409 = 127

395 + x=409+127

395 + x=536

x=536-395

x=141

3 493 − (443 + y) = 1 002

443 + y=3493-1002

443 + y=2491

y=2491-443

y=2048