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(8^a)-13+3a=12-(5^a)-7
We move all terms to the left:
(8^a)-13+3a-(12-(5^a)-7)=0
We add all the numbers together, and all the variables
3a+8^a-(12-5^a-7)-13=0
We get rid of parentheses
3a+8^a+5^a-12+7-13=0
We add all the numbers together, and all the variables
3a+8^a+5^a-18=0
We move all terms containing a to the left, all other terms to the right
3a+8^a+5^a=18
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