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25a+26=20a+66
We move all terms to the left:
25a+26-(20a+66)=0
We get rid of parentheses
25a-20a-66+26=0
We add all the numbers together, and all the variables
5a-40=0
We move all terms containing a to the left, all other terms to the right
5a=40
a=40/5
a=8
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