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-4(n+2)=12
We move all terms to the left:
-4(n+2)-(12)=0
We multiply parentheses
-4n-8-12=0
We add all the numbers together, and all the variables
-4n-20=0
We move all terms containing n to the left, all other terms to the right
-4n=20
n=20/-4
n=-5
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