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7n+6=3n-18
We move all terms to the left:
7n+6-(3n-18)=0
We get rid of parentheses
7n-3n+18+6=0
We add all the numbers together, and all the variables
4n+24=0
We move all terms containing n to the left, all other terms to the right
4n=-24
n=-24/4
n=-6
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