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4(2n-5)=-8n-20
We move all terms to the left:
4(2n-5)-(-8n-20)=0
We multiply parentheses
8n-(-8n-20)-20=0
We get rid of parentheses
8n+8n+20-20=0
We add all the numbers together, and all the variables
16n=0
n=0/16
n=0
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