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3x-13=8x-9
We move all terms to the left:
3x-13-(8x-9)=0
We get rid of parentheses
3x-8x+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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