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38-n=20-12
We move all terms to the left:
38-n-(20-12)=0
We add all the numbers together, and all the variables
-n+38-8=0
We add all the numbers together, and all the variables
-1n+30=0
We move all terms containing n to the left, all other terms to the right
-n=-30
n=-30/-1
n=+30
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