9=21-3j

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Solution for 9=21-3j equation: 



9=21-3j

We move all terms to the left:

9-(21-3j)=0

We add all the numbers together, and all the variables

-(-3j+21)+9=0

We get rid of parentheses

3j-21+9=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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