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47=4a-1
We move all terms to the left:
47-(4a-1)=0
We get rid of parentheses
-4a+1+47=0
We add all the numbers together, and all the variables
-4a+48=0
We move all terms containing a to the left, all other terms to the right
-4a=-48
a=-48/-4
a=+12
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