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30=6j-18
We move all terms to the left:
30-(6j-18)=0
We get rid of parentheses
-6j+18+30=0
We add all the numbers together, and all the variables
-6j+48=0
We move all terms containing j to the left, all other terms to the right
-6j=-48
j=-48/-6
j=+8
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