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31=225-n
We move all terms to the left:
31-(225-n)=0
We add all the numbers together, and all the variables
-(-1n+225)+31=0
We get rid of parentheses
1n-225+31=0
We add all the numbers together, and all the variables
n-194=0
We move all terms containing n to the left, all other terms to the right
n=194
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