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71=5k+21
We move all terms to the left:
71-(5k+21)=0
We get rid of parentheses
-5k-21+71=0
We add all the numbers together, and all the variables
-5k+50=0
We move all terms containing k to the left, all other terms to the right
-5k=-50
k=-50/-5
k=+10
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