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3(2k+8)=21
We move all terms to the left:
3(2k+8)-(21)=0
We multiply parentheses
6k+24-21=0
We add all the numbers together, and all the variables
6k+3=0
We move all terms containing k to the left, all other terms to the right
6k=-3
k=-3/6
k=-1/2
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