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35=2n-21
We move all terms to the left:
35-(2n-21)=0
We get rid of parentheses
-2n+21+35=0
We add all the numbers together, and all the variables
-2n+56=0
We move all terms containing n to the left, all other terms to the right
-2n=-56
n=-56/-2
n=+28
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