Question 520008
(5+k) / 2 = (2 + 6 + k)/3
(5+k) / 2 = (8 + k)/3
3(5+k)=2(8+k)
15+3k=16+2k
3k-2k=16-15
k=1



Check
======
(5+k) / 2 = (2 + 6 + k)/3
(5+1) / 2 = (2 + 6 + 1)/3
6/2=9/3
3=3