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-(3x-9)=18
We move all terms to the left:
-(3x-9)-(18)=0
We get rid of parentheses
-3x+9-18=0
We add all the numbers together, and all the variables
-3x-9=0
We move all terms containing x to the left, all other terms to the right
-3x=9
x=9/-3
x=-3
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