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28+(4a+8)=8a
We move all terms to the left:
28+(4a+8)-(8a)=0
We add all the numbers together, and all the variables
-8a+(4a+8)+28=0
We get rid of parentheses
-8a+4a+8+28=0
We add all the numbers together, and all the variables
-4a+36=0
We move all terms containing a to the left, all other terms to the right
-4a=-36
a=-36/-4
a=+9
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