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