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521=685-j
We move all terms to the left:
521-(685-j)=0
We add all the numbers together, and all the variables
-(-1j+685)+521=0
We get rid of parentheses
1j-685+521=0
We add all the numbers together, and all the variables
j-164=0
We move all terms containing j to the left, all other terms to the right
j=164
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