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