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-145=5(-9+n)
We move all terms to the left:
-145-(5(-9+n))=0
We add all the numbers together, and all the variables
-(5(n-9))-145=0
We calculate terms in parentheses: -(5(n-9)), so:We get rid of parentheses
5(n-9)
We multiply parentheses
5n-45
Back to the equation:
-(5n-45)
-5n+45-145=0
We add all the numbers together, and all the variables
-5n-100=0
We move all terms containing n to the left, all other terms to the right
-5n=100
n=100/-5
n=-20
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