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-(x+9)=15
We move all terms to the left:
-(x+9)-(15)=0
We get rid of parentheses
-x-9-15=0
We add all the numbers together, and all the variables
-1x-24=0
We move all terms containing x to the left, all other terms to the right
-x=24
x=24/-1
x=-24
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