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-12n-20=20-10n
We move all terms to the left:
-12n-20-(20-10n)=0
We add all the numbers together, and all the variables
-12n-(-10n+20)-20=0
We get rid of parentheses
-12n+10n-20-20=0
We add all the numbers together, and all the variables
-2n-40=0
We move all terms containing n to the left, all other terms to the right
-2n=40
n=40/-2
n=-20
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