Ответ:
х=2у-10
7(2у-10) - 4у = 7
14у-70-4у = 7
10у=77
у = 77/10
х= 2у-10=77/5 - 10 = 27/5
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Ответ:
х=2у-10
7(2у-10) - 4у = 7
14у-70-4у = 7
10у=77
у = 77/10
х= 2у-10=77/5 - 10 = 27/5