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5(2n+1)=55
We move all terms to the left:
5(2n+1)-(55)=0
We multiply parentheses
10n+5-55=0
We add all the numbers together, and all the variables
10n-50=0
We move all terms containing n to the left, all other terms to the right
10n=50
n=50/10
n=5
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