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2n+45=5n+31
We move all terms to the left:
2n+45-(5n+31)=0
We get rid of parentheses
2n-5n-31+45=0
We add all the numbers together, and all the variables
-3n+14=0
We move all terms containing n to the left, all other terms to the right
-3n=-14
n=-14/-3
n=4+2/3
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