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-(3x+4)+2x=9
We move all terms to the left:
-(3x+4)+2x-(9)=0
We add all the numbers together, and all the variables
2x-(3x+4)-9=0
We get rid of parentheses
2x-3x-4-9=0
We add all the numbers together, and all the variables
-1x-13=0
We move all terms containing x to the left, all other terms to the right
-x=13
x=13/-1
x=-13
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