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-2n-20=-4(2n-1)
We move all terms to the left:
-2n-20-(-4(2n-1))=0
We calculate terms in parentheses: -(-4(2n-1)), so:We get rid of parentheses
-4(2n-1)
We multiply parentheses
-8n+4
Back to the equation:
-(-8n+4)
-2n+8n-4-20=0
We add all the numbers together, and all the variables
6n-24=0
We move all terms containing n to the left, all other terms to the right
6n=24
n=24/6
n=4
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