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21x+6=23x-6
We move all terms to the left:
21x+6-(23x-6)=0
We get rid of parentheses
21x-23x+6+6=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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