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-28+8n=5n+3n-21
We move all terms to the left:
-28+8n-(5n+3n-21)=0
We add all the numbers together, and all the variables
8n-(8n-21)-28=0
We get rid of parentheses
8n-8n+21-28=0
We add all the numbers together, and all the variables
-7!=0
There is no solution for this equation
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