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8=20-j
We move all terms to the left:
8-(20-j)=0
We add all the numbers together, and all the variables
-(-1j+20)+8=0
We get rid of parentheses
1j-20+8=0
We add all the numbers together, and all the variables
j-12=0
We move all terms containing j to the left, all other terms to the right
j=12
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