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20=k/5+15
We move all terms to the left:
20-(k/5+15)=0
We get rid of parentheses
-k/5-15+20=0
We multiply all the terms by the denominator
-k-15*5+20*5=0
We add all the numbers together, and all the variables
-1k+25=0
We move all terms containing k to the left, all other terms to the right
-k=-25
k=-25/-1
k=+25
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