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4+2n=5n+9
We move all terms to the left:
4+2n-(5n+9)=0
We get rid of parentheses
2n-5n-9+4=0
We add all the numbers together, and all the variables
-3n-5=0
We move all terms containing n to the left, all other terms to the right
-3n=5
n=5/-3
n=-1+2/3
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