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