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12=14a+9
We move all terms to the left:
12-(14a+9)=0
We get rid of parentheses
-14a-9+12=0
We add all the numbers together, and all the variables
-14a+3=0
We move all terms containing a to the left, all other terms to the right
-14a=-3
a=-3/-14
a=3/14
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