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4x+13=x+20
We move all terms to the left:
4x+13-(x+20)=0
We get rid of parentheses
4x-x-20+13=0
We add all the numbers together, and all the variables
3x-7=0
We move all terms containing x to the left, all other terms to the right
3x=7
x=7/3
x=2+1/3
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