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(3+7k)(2)=
We move all terms to the left:
(3+7k)(2)-()=0
We add all the numbers together, and all the variables
(7k+3)2-()=0
We add all the numbers together, and all the variables
(7k+3)2=0
We multiply parentheses
14k+6=0
We move all terms containing k to the left, all other terms to the right
14k=-6
k=-6/14
k=-3/7
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