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20-8a=12-8a
We move all terms to the left:
20-8a-(12-8a)=0
We add all the numbers together, and all the variables
-8a-(-8a+12)+20=0
We get rid of parentheses
-8a+8a-12+20=0
We add all the numbers together, and all the variables
8!=0
There is no solution for this equation
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