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-2(n+3)=9
We move all terms to the left:
-2(n+3)-(9)=0
We multiply parentheses
-2n-6-9=0
We add all the numbers together, and all the variables
-2n-15=0
We move all terms containing n to the left, all other terms to the right
-2n=15
n=15/-2
n=-7+1/2
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