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