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8a-7=3a+28
We move all terms to the left:
8a-7-(3a+28)=0
We get rid of parentheses
8a-3a-28-7=0
We add all the numbers together, and all the variables
5a-35=0
We move all terms containing a to the left, all other terms to the right
5a=35
a=35/5
a=7
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