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21+3j=4-3j
We move all terms to the left:
21+3j-(4-3j)=0
We add all the numbers together, and all the variables
3j-(-3j+4)+21=0
We get rid of parentheses
3j+3j-4+21=0
We add all the numbers together, and all the variables
6j+17=0
We move all terms containing j to the left, all other terms to the right
6j=-17
j=-17/6
j=-2+5/6
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