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-147=-7(7n+1)+7
We move all terms to the left:
-147-(-7(7n+1)+7)=0
We calculate terms in parentheses: -(-7(7n+1)+7), so:We get rid of parentheses
-7(7n+1)+7
We multiply parentheses
-49n-7+7
We add all the numbers together, and all the variables
-49n
Back to the equation:
-(-49n)
49n-147=0
We move all terms containing n to the left, all other terms to the right
49n=147
n=147/49
n=3
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