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8n+12=3n-3
We move all terms to the left:
8n+12-(3n-3)=0
We get rid of parentheses
8n-3n+3+12=0
We add all the numbers together, and all the variables
5n+15=0
We move all terms containing n to the left, all other terms to the right
5n=-15
n=-15/5
n=-3
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