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21+3j+3j=9
Add 3j to both sides.
21+6j=9
Combine 3j and 3j to get 6j.
6j=9-21
Subtract 21 from both sides.
6j=-12
Subtract 21 from 9 to get -12.
j=\frac{-12}{6}
Divide both sides by 6.
j=-2
Divide -12 by 6 to get -2.