If the x power of a is equal to the W power of 70, then the w-th power of a is equal to the z-th power of 70 ~ why? I don't know why,

If the x power of a is equal to the W power of 70, then the w-th power of a is equal to the z-th power of 70 ~ why? I don't know why,

A ^ x = 70 ^ w simultaneous XW root
Then a ^ (1 / W) = 70 ^ (1 / x)