Объяснение:
5х+11у=21
5х+11у-21=21-21
5х+11у-21=0
8х-23у=-7
8х-23у+7=-7+7
8х-23у+7=0
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Объяснение:
5х+11у=21
5х+11у-21=21-21
5х+11у-21=0
8х-23у=-7
8х-23у+7=-7+7
8х-23у+7=0