The mathematical expression of the given above is,
(x^1/7)^5 x (x^17)^5
Take note that for (x^n)^m, the answer is x^nm. For our expression above,
(x^5/7) x (x^5/7)
Another rule for exponent is that for (x^n) x (x^m) the answer would be x^(n + m). For the expression,
x^10/7