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5n+7n+5=12n+5
We move all terms to the left:
5n+7n+5-(12n+5)=0
We add all the numbers together, and all the variables
12n-(12n+5)+5=0
We get rid of parentheses
12n-12n-5+5=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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