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21n+5=7n-5
We move all terms to the left:
21n+5-(7n-5)=0
We get rid of parentheses
21n-7n+5+5=0
We add all the numbers together, and all the variables
14n+10=0
We move all terms containing n to the left, all other terms to the right
14n=-10
n=-10/14
n=-5/7
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