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5x-40=2x-13
We move all terms to the left:
5x-40-(2x-13)=0
We get rid of parentheses
5x-2x+13-40=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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