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39+2x=12+5x
We move all terms to the left:
39+2x-(12+5x)=0
We add all the numbers together, and all the variables
2x-(5x+12)+39=0
We get rid of parentheses
2x-5x-12+39=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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