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