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31n-28=6(4n+7)
We move all terms to the left:
31n-28-(6(4n+7))=0
We calculate terms in parentheses: -(6(4n+7)), so:We get rid of parentheses
6(4n+7)
We multiply parentheses
24n+42
Back to the equation:
-(24n+42)
31n-24n-42-28=0
We add all the numbers together, and all the variables
7n-70=0
We move all terms containing n to the left, all other terms to the right
7n=70
n=70/7
n=10
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