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-309=-7(7n-6)-8
We move all terms to the left:
-309-(-7(7n-6)-8)=0
We calculate terms in parentheses: -(-7(7n-6)-8), so:We get rid of parentheses
-7(7n-6)-8
We multiply parentheses
-49n+42-8
We add all the numbers together, and all the variables
-49n+34
Back to the equation:
-(-49n+34)
49n-34-309=0
We add all the numbers together, and all the variables
49n-343=0
We move all terms containing n to the left, all other terms to the right
49n=343
n=343/49
n=7
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