Ответ:а) x · 7 = 343; x = 343 : 7; x = 49.б) x + 285 = 614; x = 614 − 285; x = 329.в) 936 − x = 417; x = 936 − 417; x = 519.г) x − 168 = 257; x = 257 + 168; x = 425.