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3-3j=-j-9
We move all terms to the left:
3-3j-(-j-9)=0
We add all the numbers together, and all the variables
-3j-(-1j-9)+3=0
We get rid of parentheses
-3j+1j+9+3=0
We add all the numbers together, and all the variables
-2j+12=0
We move all terms containing j to the left, all other terms to the right
-2j=-12
j=-12/-2
j=+6
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