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2a-8=3a+21
We move all terms to the left:
2a-8-(3a+21)=0
We get rid of parentheses
2a-3a-21-8=0
We add all the numbers together, and all the variables
-1a-29=0
We move all terms containing a to the left, all other terms to the right
-a=29
a=29/-1
a=-29
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