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20=k.4
We move all terms to the left:
20-(k.4)=0
We add all the numbers together, and all the variables
-(+k.4)+20=0
We get rid of parentheses
-k.4+20=0
We move all terms containing k to the left, all other terms to the right
-k.4=-20
k=-20/1
k=-20
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