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-(-3+x)=9
We move all terms to the left:
-(-3+x)-(9)=0
We add all the numbers together, and all the variables
-(x-3)-9=0
We get rid of parentheses
-x+3-9=0
We add all the numbers together, and all the variables
-1x-6=0
We move all terms containing x to the left, all other terms to the right
-x=6
x=6/-1
x=-6
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