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9x+13=13+9x
We move all terms to the left:
9x+13-(13+9x)=0
We add all the numbers together, and all the variables
9x-(9x+13)+13=0
We get rid of parentheses
9x-9x-13+13=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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