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13=9x+-3x
We move all terms to the left:
13-(9x+-3x)=0
We add all the numbers together, and all the variables
-(+6x)+13=0
We get rid of parentheses
-6x+13=0
We move all terms containing x to the left, all other terms to the right
-6x=-13
x=-13/-6
x=2+1/6
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