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23x-8=20x+4
We move all terms to the left:
23x-8-(20x+4)=0
We get rid of parentheses
23x-20x-4-8=0
We add all the numbers together, and all the variables
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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