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3n+4(5+5n)=20-4n
We move all terms to the left:
3n+4(5+5n)-(20-4n)=0
We add all the numbers together, and all the variables
3n+4(5n+5)-(-4n+20)=0
We multiply parentheses
3n+20n-(-4n+20)+20=0
We get rid of parentheses
3n+20n+4n-20+20=0
We add all the numbers together, and all the variables
27n=0
n=0/27
n=0
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