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12n+8=-4n
We move all terms to the left:
12n+8-(-4n)=0
We get rid of parentheses
12n+4n+8=0
We add all the numbers together, and all the variables
16n+8=0
We move all terms containing n to the left, all other terms to the right
16n=-8
n=-8/16
n=-1/2
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