(39+Х)-84=78 (Х-83)+316=425
39+Х-84=78 Х-83+316=425
39+Х=78 +84 Х-83=425-316
39+Х=162 Х-83=109
Х=162-39 Х=109+83
Х=123 Х=192
(39+123)-84=78 (192-83)+316=425
78=78 425=425
(600-Х)-92=126
600-Х=126+92
600-Х=218
Х=600-218
Х=382
(600-382)-92=126
126=126
1)(39+x)=78+84
39+x=162
x=162-39
x=123
ответ:123
2)(x-83)=425-316
x-83=109
x=109+83
x=192
ответ:192
3)(600-x)=126+92
600-x=218
x=600-218
x=382
ответ:382
(39+Х)-84=78 (Х-83)+316=425
39+Х-84=78 Х-83+316=425
39+Х=78 +84 Х-83=425-316
39+Х=162 Х-83=109
Х=162-39 Х=109+83
Х=123 Х=192
(39+123)-84=78 (192-83)+316=425
78=78 425=425
(600-Х)-92=126
600-Х=126+92
600-Х=218
Х=600-218
Х=382
(600-382)-92=126
126=126