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-7(n-4)=7n+28
We move all terms to the left:
-7(n-4)-(7n+28)=0
We multiply parentheses
-7n-(7n+28)+28=0
We get rid of parentheses
-7n-7n-28+28=0
We add all the numbers together, and all the variables
-14n=0
n=0/-14
n=0
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