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20-5k=3k+4
We move all terms to the left:
20-5k-(3k+4)=0
We get rid of parentheses
-5k-3k-4+20=0
We add all the numbers together, and all the variables
-8k+16=0
We move all terms containing k to the left, all other terms to the right
-8k=-16
k=-16/-8
k=+2
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