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3x-(4+2x)=39
We move all terms to the left:
3x-(4+2x)-(39)=0
We add all the numbers together, and all the variables
3x-(2x+4)-39=0
We get rid of parentheses
3x-2x-4-39=0
We add all the numbers together, and all the variables
x-43=0
We move all terms containing x to the left, all other terms to the right
x=43
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