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13-4x=x+9
We move all terms to the left:
13-4x-(x+9)=0
We get rid of parentheses
-4x-x-9+13=0
We add all the numbers together, and all the variables
-5x+4=0
We move all terms containing x to the left, all other terms to the right
-5x=-4
x=-4/-5
x=4/5
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