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-5-5(n-7)=-40+5n
We move all terms to the left:
-5-5(n-7)-(-40+5n)=0
We add all the numbers together, and all the variables
-5(n-7)-(5n-40)-5=0
We multiply parentheses
-5n-(5n-40)+35-5=0
We get rid of parentheses
-5n-5n+40+35-5=0
We add all the numbers together, and all the variables
-10n+70=0
We move all terms containing n to the left, all other terms to the right
-10n=-70
n=-70/-10
n=+7
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