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3(-2k+1)=221
We move all terms to the left:
3(-2k+1)-(221)=0
We multiply parentheses
-6k+3-221=0
We add all the numbers together, and all the variables
-6k-218=0
We move all terms containing k to the left, all other terms to the right
-6k=218
k=218/-6
k=-36+1/3
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