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24a-8=20a-20
We move all terms to the left:
24a-8-(20a-20)=0
We get rid of parentheses
24a-20a+20-8=0
We add all the numbers together, and all the variables
4a+12=0
We move all terms containing a to the left, all other terms to the right
4a=-12
a=-12/4
a=-3
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