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-4(8-5a)=28+8a
We move all terms to the left:
-4(8-5a)-(28+8a)=0
We add all the numbers together, and all the variables
-4(-5a+8)-(8a+28)=0
We multiply parentheses
20a-(8a+28)-32=0
We get rid of parentheses
20a-8a-28-32=0
We add all the numbers together, and all the variables
12a-60=0
We move all terms containing a to the left, all other terms to the right
12a=60
a=60/12
a=5
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