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23x-3=21x+5
We move all terms to the left:
23x-3-(21x+5)=0
We get rid of parentheses
23x-21x-5-3=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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