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3x+3(3x-13)=-123
We move all terms to the left:
3x+3(3x-13)-(-123)=0
We add all the numbers together, and all the variables
3x+3(3x-13)+123=0
We multiply parentheses
3x+9x-39+123=0
We add all the numbers together, and all the variables
12x+84=0
We move all terms containing x to the left, all other terms to the right
12x=-84
x=-84/12
x=-7
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