Find two nontrivial functions `f(x)` and `g(x)` so `f(g(x)) = 4/(x+7)^3`

`f(x)` =  
`g(x)` =  

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Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question

Box 2: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question