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-1=-k/5+3
We move all terms to the left:
-1-(-k/5+3)=0
We get rid of parentheses
k/5-3-1=0
We multiply all the terms by the denominator
k-3*5-1*5=0
We add all the numbers together, and all the variables
k-20=0
We move all terms containing k to the left, all other terms to the right
k=20
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