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43a+20=27a+28
We move all terms to the left:
43a+20-(27a+28)=0
We get rid of parentheses
43a-27a-28+20=0
We add all the numbers together, and all the variables
16a-8=0
We move all terms containing a to the left, all other terms to the right
16a=8
a=8/16
a=1/2
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