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-9.8-8.4j=6.4j+7.8
We move all terms to the left:
-9.8-8.4j-(6.4j+7.8)=0
We get rid of parentheses
-8.4j-6.4j-7.8-9.8=0
We add all the numbers together, and all the variables
-14.8j-17.6=0
We move all terms containing j to the left, all other terms to the right
-14.8j=17.6
j=17.6/-14.8
j=-1+1/5.2857142857143
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