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31=2n+3
We move all terms to the left:
31-(2n+3)=0
We get rid of parentheses
-2n-3+31=0
We add all the numbers together, and all the variables
-2n+28=0
We move all terms containing n to the left, all other terms to the right
-2n=-28
n=-28/-2
n=+14
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