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-21=5k-11
We move all terms to the left:
-21-(5k-11)=0
We get rid of parentheses
-5k+11-21=0
We add all the numbers together, and all the variables
-5k-10=0
We move all terms containing k to the left, all other terms to the right
-5k=10
k=10/-5
k=-2
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