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28=6a-2
We move all terms to the left:
28-(6a-2)=0
We get rid of 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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