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48=12a+9
We move all terms to the left:
48-(12a+9)=0
We get rid of parentheses
-12a-9+48=0
We add all the numbers together, and all the variables
-12a+39=0
We move all terms containing a to the left, all other terms to the right
-12a=-39
a=-39/-12
a=3+1/4
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