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2(1=2n)=2n-2(n+9)
We move all terms to the left:
2(1-(2n))=0
We add all the numbers together, and all the variables
2(-2n+1)=0
We multiply parentheses
-4n+2=0
We move all terms containing n to the left, all other terms to the right
-4n=-2
n=-2/-4
n=1/2
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