7n+n на 2 меньше 8n+2, значит (8n+2)-(7n+n)=2
7n+7 = 8n+2 - 2
7n+7 = 8n
8n7n = 7
n=7
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7n+n на 2 меньше 8n+2, значит (8n+2)-(7n+n)=2
7n+7 = 8n+2 - 2
7n+7 = 8n
8n7n = 7
n=7