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(a+8)+a+(2a)=92
We move all terms to the left:
(a+8)+a+(2a)-(92)=0
We add all the numbers together, and all the variables
3a+(a+8)-92=0
We get rid of parentheses
3a+a+8-92=0
We add all the numbers together, and all the variables
4a-84=0
We move all terms containing a to the left, all other terms to the right
4a=84
a=84/4
a=21
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