1)(39+х)-84=78
39+x-84=78
x=78-39+84=123
==================================
2)(х-83)+316=425
x-83+316 = 425
x=425+83-316 =192
3)(600-х)-92=126
600-x - 92 = 126
-x = 126-600+92 =
-x = -382
x=382
====================================
х+27-14=36
x=36-27+14 = 23
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Answers & Comments
39+х=78+84
39+х=162
х=162-39
х=123
(х-83)+316=425
х-83=425-316
х-83=109
х=109+83
х=192
(600-х)-92=126
600-х=126+92
600-х=218
х=600-218
х=382
х+27-14=36
х+27=36+14
х+27=50
х=50-27
х=23
1)(39+х)-84=78
39+x-84=78
x=78-39+84=123
==================================
2)(х-83)+316=425
x-83+316 = 425
x=425+83-316 =192
==================================
3)(600-х)-92=126
600-x - 92 = 126
-x = 126-600+92 =
-x = -382
x=382
====================================
х+27-14=36
x=36-27+14 = 23