(х-354)+257=605
x – 354 + 257 = 605
x = 605 – 257 + 354
x = 702
(х+348)-542=227
x + 348 – 542 = 227
x = 227 + 542 – 348
x = 421
(х-354)+257=605
x – 354 + 257 = 605
x = 605 – 257 + 354
x = 702
(х+348)-542=227
x + 348 – 542 = 227
x = 227 + 542 – 348
x = 421