9+3j=-21

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Solution for 9+3j=-21 equation: 



9+3j=-21

We move all terms to the left:

9+3j-(-21)=0

We add all the numbers together, and all the variables

3j+30=0

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

3j=-30

j=-30/3

j=-10

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