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да имеет
Объяснение:
решим первые два
х-у=3
х=-1-у
-1-у-у=3
у=-2
х=-1-(-2)
х=1
и подставим эти значения в 3 уравнение:
2*1-3*(-2)=8
2+6=8
8=8
получаем верное равенство, следовательно, система имеет решение