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17=20-j
We move all terms to the left:
17-(20-j)=0
We add all the numbers together, and all the variables
-(-1j+20)+17=0
We get rid of parentheses
1j-20+17=0
We add all the numbers together, and all the variables
j-3=0
We move all terms containing j to the left, all other terms to the right
j=3
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