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5x+13=2x+31
We move all terms to the left:
5x+13-(2x+31)=0
We get rid of parentheses
5x-2x-31+13=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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