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5=31n-21
We move all terms to the left:
5-(31n-21)=0
We get rid of parentheses
-31n+21+5=0
We add all the numbers together, and all the variables
-31n+26=0
We move all terms containing n to the left, all other terms to the right
-31n=-26
n=-26/-31
n=26/31
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