12j-9j=12

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Solution for 12j-9j=12 equation: 



12j-9j=12

We move all terms to the left:

12j-9j-(12)=0

We add all the numbers together, and all the variables

3j-12=0

We move all terms containing j to the left, all other terms to the right

3j=12

j=12/3

j=4

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