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-5n+7=4-8n

We move all terms to the left:

-5n+7-(4-8n)=0

We add all the numbers together, and all the variables

-5n-(-8n+4)+7=0

We get rid of parentheses

-5n+8n-4+7=0

We add all the numbers together, and all the variables

3n+3=0

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

3n=-3

n=-3/3

n=-1

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