21-2j=9

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Solution for 21-2j=9 equation: 



21-2j=9

We move all terms to the left:

21-2j-(9)=0

We add all the numbers together, and all the variables

-2j+12=0

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

-2j=-12

j=-12/-2

j=+6

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