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3x+13=40+2x
We move all terms to the left:
3x+13-(40+2x)=0
We add all the numbers together, and all the variables
3x-(2x+40)+13=0
We get rid of parentheses
3x-2x-40+13=0
We add all the numbers together, and all the variables
x-27=0
We move all terms containing x to the left, all other terms to the right
x=27
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