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9=13-j
We move all terms to the left:
9-(13-j)=0
We add all the numbers together, and all the variables
-(-1j+13)+9=0
We get rid of parentheses
1j-13+9=0
We add all the numbers together, and all the variables
j-4=0
We move all terms containing j to the left, all other terms to the right
j=4
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