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3x-4(2x-1)=39
We move all terms to the left:
3x-4(2x-1)-(39)=0
We multiply parentheses
3x-8x+4-39=0
We add all the numbers together, and all the variables
-5x-35=0
We move all terms containing x to the left, all other terms to the right
-5x=35
x=35/-5
x=-7
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