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6x-9=8x-13
We move all terms to the left:
6x-9-(8x-13)=0
We get rid of parentheses
6x-8x+13-9=0
We add all the numbers together, and all the variables
-2x+4=0
We move all terms containing x to the left, all other terms to the right
-2x=-4
x=-4/-2
x=+2
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