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3-2n=4n+7
We move all terms to the left:
3-2n-(4n+7)=0
We get rid of parentheses
-2n-4n-7+3=0
We add all the numbers together, and all the variables
-6n-4=0
We move all terms containing n to the left, all other terms to the right
-6n=4
n=4/-6
n=-2/3
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