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-39+x=54-2x
We move all terms to the left:
-39+x-(54-2x)=0
We add all the numbers together, and all the variables
x-(-2x+54)-39=0
We get rid of parentheses
x+2x-54-39=0
We add all the numbers together, and all the variables
3x-93=0
We move all terms containing x to the left, all other terms to the right
3x=93
x=93/3
x=31
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