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-(2x+9)=-30
We move all terms to the left:
-(2x+9)-(-30)=0
We add all the numbers together, and all the variables
-(2x+9)+30=0
We get rid of parentheses
-2x-9+30=0
We add all the numbers together, and all the variables
-2x+21=0
We move all terms containing x to the left, all other terms to the right
-2x=-21
x=-21/-2
x=10+1/2
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