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3n+1=4n-9
We move all terms to the left:
3n+1-(4n-9)=0
We get rid of parentheses
3n-4n+9+1=0
We add all the numbers together, and all the variables
-1n+10=0
We move all terms containing n to the left, all other terms to the right
-n=-10
n=-10/-1
n=+10
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