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