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6n+12-12=42-12
We move all terms to the left:
6n+12-12-(42-12)=0
We add all the numbers together, and all the variables
6n+12-12-30=0
We add all the numbers together, and all the variables
6n-30=0
We move all terms containing n to the left, all other terms to the right
6n=30
n=30/6
n=5
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