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2(3a-1)=28
We move all terms to the left:
2(3a-1)-(28)=0
We multiply parentheses
6a-2-28=0
We add all the numbers together, and all the variables
6a-30=0
We move all terms containing a to the left, all other terms to the right
6a=30
a=30/6
a=5
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