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20=2.5k
We move all terms to the left:
20-(2.5k)=0
We add all the numbers together, and all the variables
-(+2.5k)+20=0
We get rid of parentheses
-2.5k+20=0
We move all terms containing k to the left, all other terms to the right
-2.5k=-20
k=-20/-2.5
k=+8
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