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5(2n+4)=30
We move all terms to the left:
5(2n+4)-(30)=0
We multiply parentheses
10n+20-30=0
We add all the numbers together, and all the variables
10n-10=0
We move all terms containing n to the left, all other terms to the right
10n=10
n=10/10
n=1
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