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