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-7(n-7)+3n=40-7n
We move all terms to the left:
-7(n-7)+3n-(40-7n)=0
We add all the numbers together, and all the variables
-7(n-7)+3n-(-7n+40)=0
We add all the numbers together, and all the variables
3n-7(n-7)-(-7n+40)=0
We multiply parentheses
3n-7n-(-7n+40)+49=0
We get rid of parentheses
3n-7n+7n-40+49=0
We add all the numbers together, and all the variables
3n+9=0
We move all terms containing n to the left, all other terms to the right
3n=-9
n=-9/3
n=-3
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