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-9+3x=13+x
We move all terms to the left:
-9+3x-(13+x)=0
We add all the numbers together, and all the variables
3x-(x+13)-9=0
We get rid of parentheses
3x-x-13-9=0
We add all the numbers together, and all the variables
2x-22=0
We move all terms containing x to the left, all other terms to the right
2x=22
x=22/2
x=11
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