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(3x-9)=-15
We move all terms to the left:
(3x-9)-(-15)=0
We add all the numbers together, and all the variables
(3x-9)+15=0
We get rid of parentheses
3x-9+15=0
We add all the numbers together, and all the variables
3x+6=0
We move all terms containing x to the left, all other terms to the right
3x=-6
x=-6/3
x=-2
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