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-81=-45-9n
We move all terms to the left:
-81-(-45-9n)=0
We add all the numbers together, and all the variables
-(-9n-45)-81=0
We get rid of parentheses
9n+45-81=0
We add all the numbers together, and all the variables
9n-36=0
We move all terms containing n to the left, all other terms to the right
9n=36
n=36/9
n=4
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