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20a-6=15a-5
We move all terms to the left:
20a-6-(15a-5)=0
We get rid of parentheses
20a-15a+5-6=0
We add all the numbers together, and all the variables
5a-1=0
We move all terms containing a to the left, all other terms to the right
5a=1
a=1/5
a=1/5
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