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4n-12=5n-20
We move all terms to the left:
4n-12-(5n-20)=0
We get rid of parentheses
4n-5n+20-12=0
We add all the numbers together, and all the variables
-1n+8=0
We move all terms containing n to the left, all other terms to the right
-n=-8
n=-8/-1
n=+8
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