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-4(5a-3)=28
We move all terms to the left:
-4(5a-3)-(28)=0
We multiply parentheses
-20a+12-28=0
We add all the numbers together, and all the variables
-20a-16=0
We move all terms containing a to the left, all other terms to the right
-20a=16
a=16/-20
a=-4/5
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