Answer:
It's 0
Explanation:
6/15 is also 2/5 so it would be x + 2/5 = 2/5 so if you subtract 2/5 with 2/5, x becomes zero! In another way, if you multiply everything by 15, it would be 15x + 6 = 6. See? It's still the same answer in two different ways!
I'm glad I helped you and I hope you have a great day!