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-2(j+6)=20
We move all terms to the left:
-2(j+6)-(20)=0
We multiply parentheses
-2j-12-20=0
We add all the numbers together, and all the variables
-2j-32=0
We move all terms containing j to the left, all other terms to the right
-2j=32
j=32/-2
j=-16
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