solve for k.

d = 1/2kp

To solve for k, we need to isolate k on one side of the equation. We can do this by dividing both sides of the equation by (1/2p):

d = 1/(2kp)

Multiplying both sides by 2p:

2pd = 1/k

Dividing both sides by 2pd:

k = 1/(2pd)

So, k = 1/(2pd)