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a(a+8)-a(a+3)-23=3a+1
We move all terms to the left:
a(a+8)-a(a+3)-23-(3a+1)=0
We multiply parentheses
a^2-a^2+8a-3a-(3a+1)-23=0
We get rid of parentheses
a^2-a^2+8a-3a-3a-1-23=0
We add all the numbers together, and all the variables
2a-24=0
We move all terms containing a to the left, all other terms to the right
2a=24
a=24/2
a=12
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