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7-13j=-20-10j
We move all terms to the left:
7-13j-(-20-10j)=0
We add all the numbers together, and all the variables
-13j-(-10j-20)+7=0
We get rid of parentheses
-13j+10j+20+7=0
We add all the numbers together, and all the variables
-3j+27=0
We move all terms containing j to the left, all other terms to the right
-3j=-27
j=-27/-3
j=+9
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