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31=4n+3n+3
We move all terms to the left:
31-(4n+3n+3)=0
We add all the numbers together, and all the variables
-(7n+3)+31=0
We get rid of parentheses
-7n-3+31=0
We add all the numbers together, and all the variables
-7n+28=0
We move all terms containing n to the left, all other terms to the right
-7n=-28
n=-28/-7
n=+4
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