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3(9+2x)=39
We move all terms to the left:
3(9+2x)-(39)=0
We add all the numbers together, and all the variables
3(2x+9)-39=0
We multiply parentheses
6x+27-39=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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