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3(x/8)=39
We move all terms to the left:
3(x/8)-(39)=0
We add all the numbers together, and all the variables
3(+x/8)-39=0
We multiply parentheses
3x-39=0
We move all terms containing x to the left, all other terms to the right
3x=39
x=39/3
x=13
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