23х-19х+5х=1827 5х+3х-47=6401
23х-19х+5х=1827 9х=1827 х=1827:9 х=203 проверка 23•203-19•203+5•203=1827 1827=1827 5х+3х-47=6401 8х=6401+47 8х=6448 х=6448:8 х=806 проверка 5•806+3•806-47=6401 6401=6401
23х-19х+5х=1827 9х=1827 х=203 5х+3х-47=6401 8х=6448 х=806