Ответ:
1) 4x+3y=a 12-12=0 2) 7x+ay=1 21-4a=1 21-1=20 4a=20 a=5
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Ответ:
1) 4x+3y=a 12-12=0 2) 7x+ay=1 21-4a=1 21-1=20 4a=20 a=5