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13x-31=38+10x
We move all terms to the left:
13x-31-(38+10x)=0
We add all the numbers together, and all the variables
13x-(10x+38)-31=0
We get rid of parentheses
13x-10x-38-31=0
We add all the numbers together, and all the variables
3x-69=0
We move all terms containing x to the left, all other terms to the right
3x=69
x=69/3
x=23
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