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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
-(12a+8)+28=0
We get rid of parentheses
-12a-8+28=0
We add all the numbers together, and all the variables
-12a+20=0
We move all terms containing a to the left, all other terms to the right
-12a=-20
a=-20/-12
a=1+2/3
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