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13=4+3n
We move all terms to the left:
13-(4+3n)=0
We add all the numbers together, and all the variables
-(3n+4)+13=0
We get rid of parentheses
-3n-4+13=0
We add all the numbers together, and all the variables
-3n+9=0
We move all terms containing n to the left, all other terms to the right
-3n=-9
n=-9/-3
n=+3
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