Ответ:
(3; -3)
.................
х+у = 0
х = -у
2×(-у) + у = 3
-у = 3
у = -3
х = -(-3)
х = 3
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Ответ:
(3; -3)
.................
х+у = 0
х = -у
2×(-у) + у = 3
-у = 3
у = -3
х = -(-3)
х = 3