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9(n-4)=-18
We move all terms to the left:
9(n-4)-(-18)=0
We add all the numbers together, and all the variables
9(n-4)+18=0
We multiply parentheses
9n-36+18=0
We add all the numbers together, and all the variables
9n-18=0
We move all terms containing n to the left, all other terms to the right
9n=18
n=18/9
n=2
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