Answer :

Add the 10 on both sides so you have 2k=16 then divide both by 2 so k=8
I thinks you mean to solve for "k". To do this you must isolate the k on one side of the equation. Use the distribution method: 

2k-10 = 6 
Add 10 to both sides of equation 
2k = 16 
Divide both sides by 2 
k = 8 

To check the answer, substitute it in to the original equation: 
2(8)-10 = 6 
16-10 = 6 
6 = 6 

So the answer is correct. c: