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5.3n-2.2(n+3)=12
We move all terms to the left:
5.3n-2.2(n+3)-(12)=0
We multiply parentheses
5.3n-2.2n-6.6-12=0
We add all the numbers together, and all the variables
3.1n-18.6=0
We move all terms containing n to the left, all other terms to the right
3.1n=18.6
n=18.6/3.1
n=6
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