I need step by step help with the chain rule for this problem:

7(x^(7/3)+(11/7)x^(7/5)+13x^(7/7))^(4/3)

{28/3[7/3(x^4/3) +11/5(x^2/5) +13)][x^7/3+11/7x^7/5+13x^7/7]^1/3}