Question

79+х=-356
167-х=39
х-57=-493
-542+х=542

Answer 1

79+х=-356
х=-356-79
х=-435

167-х=39
-х=39-167
-х=-128
х=128

х-57=-493
х=-493+57
х=-436

-542+х=542
х=542+542
х=1084