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