Ответ:
1) 12x-7=2
12x=2+7
12x=9
2)5y=4x-6
5y-4x=-6
4x-5y=6
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Ответ:
1) 12x-7=2
12x=2+7
12x=9
2)5y=4x-6
5y-4x=-6
4x-5y=6