1) (39+Х)-84=78
39 + x – 84 = 78
x = 78 + 84 – 39
x = 123
2) (Х-83)+316=425
x – 83 + 316 = 425
x = 425 – 316 + 83
x = 192
3) (600-Х)-92=126
600 – x – 92 = 126
– x = 126 + 92 – 600
-x = -382
x = 382
4) 253-(Х-459)=138
253 – x + 459 = 138
– x = 138 – 459 – 253
-x = -574
x = 574
5) 502-(217-Х)=421
502 – 217 + x = 421
x = 421 + 217 – 502
x = 136
6) 871-(Х+157)=385
871 – x – 157 = 385
– x = 385 + 157 – 871
-x = -329
x = 329
1) (39+Х)-84=78
39 + x – 84 = 78
x = 78 + 84 – 39
x = 123
2) (Х-83)+316=425
x – 83 + 316 = 425
x = 425 – 316 + 83
x = 192
3) (600-Х)-92=126
600 – x – 92 = 126
– x = 126 + 92 – 600
-x = -382
x = 382
4) 253-(Х-459)=138
253 – x + 459 = 138
– x = 138 – 459 – 253
-x = -574
x = 574
5) 502-(217-Х)=421
502 – 217 + x = 421
x = 421 + 217 – 502
x = 136
6) 871-(Х+157)=385
871 – x – 157 = 385
– x = 385 + 157 – 871
-x = -329
x = 329