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10(2n+3)=130
We move all terms to the left:
10(2n+3)-(130)=0
We multiply parentheses
20n+30-130=0
We add all the numbers together, and all the variables
20n-100=0
We move all terms containing n to the left, all other terms to the right
20n=100
n=100/20
n=5
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