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20=5k-5
We move all terms to the left:
20-(5k-5)=0
We get rid of parentheses
-5k+5+20=0
We add all the numbers together, and all the variables
-5k+25=0
We move all terms containing k to the left, all other terms to the right
-5k=-25
k=-25/-5
k=+5
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