сразу пишу решения
x - 354 = 605 - 257
x = 348+354
x = 702
x + 348 = 227 + 542
x = 769 - 348
x = 421
(х-354)+257=605
Х-354=605-257
Х=348+354
Х=702
(702-354)+257=605
605=605
(Х+348)-542=227
Х+348=227+542
Х=769-348
Х=421
(421+348)-542=227
227=227
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сразу пишу решения
x - 354 = 605 - 257
x = 348+354
x = 702
x + 348 = 227 + 542
x = 769 - 348
x = 421
(х-354)+257=605
Х-354=605-257
Х=348+354
Х=702
(702-354)+257=605
605=605
(Х+348)-542=227
Х+348=227+542
Х=769-348
Х=421
(421+348)-542=227
227=227