(8n+1)-(7n-8)=21

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Solution for (8n+1)-(7n-8)=21 equation: 



(8n+1)-(7n-8)=21

We move all terms to the left:

(8n+1)-(7n-8)-(21)=0

We get rid of parentheses

8n-7n+1+8-21=0

We add all the numbers together, and all the variables

n-12=0

We move all terms containing n to the left, all other terms to the right

n=12

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