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20-4n=-4(n-5)
We move all terms to the left:
20-4n-(-4(n-5))=0
We calculate terms in parentheses: -(-4(n-5)), so:We get rid of parentheses
-4(n-5)
We multiply parentheses
-4n+20
Back to the equation:
-(-4n+20)
-4n+4n-20+20=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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