1) (39 + x) - 84 = 78
39 + х = 78 + 84
39 + х = 162
х = 162 - 39
х = 123
2) (x - 83) + 316 = 425
х - 83 = 425 - 316
х - 83 = 109
х = 109 + 83
х = 192
3)(600 - x) - 92 = 126
600 - х = 126 + 92
600 - х = 218
х = 600 - 218
х = 382
4)253 - (х - 459) = 138
х - 459 = 253 - 138
х - 459 = 115
х = 115 + 459
х = 574
5)502 - (217 - x) = 421
217 - х = 502 - 421
217 - х = 81
х = 217 - 81
х = 136
1) (39 + x) - 84 = 78
39 + х = 78 + 84
39 + х = 162
х = 162 - 39
х = 123
2) (x - 83) + 316 = 425
х - 83 = 425 - 316
х - 83 = 109
х = 109 + 83
х = 192
3)(600 - x) - 92 = 126
600 - х = 126 + 92
600 - х = 218
х = 600 - 218
х = 382
4)253 - (х - 459) = 138
х - 459 = 253 - 138
х - 459 = 115
х = 115 + 459
х = 574
5)502 - (217 - x) = 421
217 - х = 502 - 421
217 - х = 81
х = 217 - 81
х = 136