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-28=-20+n
We move all terms to the left:
-28-(-20+n)=0
We add all the numbers together, and all the variables
-(n-20)-28=0
We get rid of parentheses
-n+20-28=0
We add all the numbers together, and all the variables
-1n-8=0
We move all terms containing n to the left, all other terms to the right
-n=8
n=8/-1
n=-8
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