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4x+9=8x-13
We move all terms to the left:
4x+9-(8x-13)=0
We get rid of parentheses
4x-8x+13+9=0
We add all the numbers together, and all the variables
-4x+22=0
We move all terms containing x to the left, all other terms to the right
-4x=-22
x=-22/-4
x=5+1/2
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