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7-2.5(8n-16)=-20n+4
We move all terms to the left:
7-2.5(8n-16)-(-20n+4)=0
We multiply parentheses
-20n-(-20n+4)+40+7=0
We get rid of parentheses
-20n+20n-4+40+7=0
We add all the numbers together, and all the variables
43!=0
There is no solution for this equation
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