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Verified answer

1) (39+Х)-84=78
39+х = 84+78
39+х = 162
х = 162-39
х=123
Ответ: х=123
2)(х-83)+316=425
х-83 = 425-316
х-83 = 109
х= 109+83
х = 192

3) (600-х)-92=126
600-х = 126+92
600-х = 218
х = 600-218
х = 382