Question

do you know what this is 8 – 3k = 5?

Answer 1

Well, well...it must be an equation. 
8 – 3k = 5 <=> 8-3k-5=0 <=> 3-3k=0 <=> 3=3k => k=3/3 => k=1.

Answer 2

k=1

subtract 8 from 8 and 5
you will cancel out the original 8 and get -3k=-3
you still arent done, divide -3k and -3 by -3 to get rid of it
k will equal 1