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-23+3n=-3(n+7)+7n
We move all terms to the left:
-23+3n-(-3(n+7)+7n)=0
We calculate terms in parentheses: -(-3(n+7)+7n), so:We get rid of parentheses
-3(n+7)+7n
We add all the numbers together, and all the variables
7n-3(n+7)
We multiply parentheses
7n-3n-21
We add all the numbers together, and all the variables
4n-21
Back to the equation:
-(4n-21)
3n-4n+21-23=0
We add all the numbers together, and all the variables
-1n-2=0
We move all terms containing n to the left, all other terms to the right
-n=2
n=2/-1
n=-2
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