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21=2n+13
We move all terms to the left:
21-(2n+13)=0
We get rid of parentheses
-2n-13+21=0
We add all the numbers together, and all the variables
-2n+8=0
We move all terms containing n to the left, all other terms to the right
-2n=-8
n=-8/-2
n=+4
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