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3(x+4)=3x-6x
We move all terms to the left:
3(x+4)-(3x-6x)=0
We add all the numbers together, and all the variables
3(x+4)-(-3x)=0
We multiply parentheses
3x-(-3x)+12=0
We get rid of parentheses
3x+3x+12=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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