$$\frac { 2 ( 3 k - 1 ) - ( 2 k + 1 ) } { 7 k - 2 } = \frac { 1 } { 2 }$$
$k=4$
$$2\left(2\left(3k-1\right)-\left(2k+1\right)\right)=7k-2$$
$$2\left(6k-2-\left(2k+1\right)\right)=7k-2$$
$$2\left(6k-2-2k-1\right)=7k-2$$
$$2\left(4k-2-1\right)=7k-2$$
$$2\left(4k-3\right)=7k-2$$
$$8k-6=7k-2$$
$$8k-6-7k=-2$$
$$k-6=-2$$
$$k=-2+6$$
$$k=4$$
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