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5(n+-2)=45
We move all terms to the left:
5(n+-2)-(45)=0
We add all the numbers together, and all the variables
5(n-2)-45=0
We multiply parentheses
5n-10-45=0
We add all the numbers together, and all the variables
5n-55=0
We move all terms containing n to the left, all other terms to the right
5n=55
n=55/5
n=11
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