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