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14+21n=28+14n
We move all terms to the left:
14+21n-(28+14n)=0
We add all the numbers together, and all the variables
21n-(14n+28)+14=0
We get rid of parentheses
21n-14n-28+14=0
We add all the numbers together, and all the variables
7n-14=0
We move all terms containing n to the left, all other terms to the right
7n=14
n=14/7
n=2
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