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2n+4=-6n+20
We move all terms to the left:
2n+4-(-6n+20)=0
We get rid of parentheses
2n+6n-20+4=0
We add all the numbers together, and all the variables
8n-16=0
We move all terms containing n to the left, all other terms to the right
8n=16
n=16/8
n=2
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