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42=6a-6
We move all terms to the left:
42-(6a-6)=0
We get rid of parentheses
-6a+6+42=0
We add all the numbers together, and all the variables
-6a+48=0
We move all terms containing a to the left, all other terms to the right
-6a=-48
a=-48/-6
a=+8
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