Question

I don't know how to solve questions like this. k-10=-7

Answer 1

You have to add 10 to both sides of the equation because you want to have your variable (in this case it's K) to be on it's own. K=-7+10 or K=10-7 Then you subtract 7 from 10 and you get k=3. Let  me know if you don't understand.

Answer 2

K-10=-7

K=10-7   Add 7 for both side.

k=3