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-257=-20n-37
We move all terms to the left:
-257-(-20n-37)=0
We get rid of parentheses
20n+37-257=0
We add all the numbers together, and all the variables
20n-220=0
We move all terms containing n to the left, all other terms to the right
20n=220
n=220/20
n=11
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