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-4x-13=8x+23
We move all terms to the left:
-4x-13-(8x+23)=0
We get rid of parentheses
-4x-8x-23-13=0
We add all the numbers together, and all the variables
-12x-36=0
We move all terms containing x to the left, all other terms to the right
-12x=36
x=36/-12
x=-3
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