A - 4B + 2C = 16
+
2A + 7B - 5C = 83
_____________
3A + 3B - 3C = 99
: 3
A + B – C = 33
Ответ: 33.
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A - 4B + 2C = 16
+
2A + 7B - 5C = 83
_____________
3A + 3B - 3C = 99
: 3
A + B – C = 33
Ответ: 33.