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4+5n=2n+7
We move all terms to the left:
4+5n-(2n+7)=0
We get rid of parentheses
5n-2n-7+4=0
We add all the numbers together, and all the variables
3n-3=0
We move all terms containing n to the left, all other terms to the right
3n=3
n=3/3
n=1
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