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x+3=39-2x
We move all terms to the left:
x+3-(39-2x)=0
We add all the numbers together, and all the variables
x-(-2x+39)+3=0
We get rid of parentheses
x+2x-39+3=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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