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9x-23=5x+21
We move all terms to the left:
9x-23-(5x+21)=0
We get rid of parentheses
9x-5x-21-23=0
We add all the numbers together, and all the variables
4x-44=0
We move all terms containing x to the left, all other terms to the right
4x=44
x=44/4
x=11
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