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2a-(8a+1)-(a+2)*5=0
We multiply parentheses
2a-(8a+1)-5a-10=0
We get rid of parentheses
2a-8a-5a-1-10=0
We add all the numbers together, and all the variables
-11a-11=0
We move all terms containing a to the left, all other terms to the right
-11a=11
a=11/-11
a=-1
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