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-2x+13=9x-20
We move all terms to the left:
-2x+13-(9x-20)=0
We get rid of parentheses
-2x-9x+20+13=0
We add all the numbers together, and all the variables
-11x+33=0
We move all terms containing x to the left, all other terms to the right
-11x=-33
x=-33/-11
x=+3
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