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7n+6=4n-15
We move all terms to the left:
7n+6-(4n-15)=0
We get rid of parentheses
7n-4n+15+6=0
We add all the numbers together, and all the variables
3n+21=0
We move all terms containing n to the left, all other terms to the right
3n=-21
n=-21/3
n=-7
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