No, you are not to "set them equal" to anything. You are only asked to "separate" the constant from the variable.

However, I need to know if "-2a^3/7" is "-2a^(3/7)" or "-2a^(3)/7= (-2/7)a^3". In the first case, the "constant" is -2 while the "term" is a^(3/7). In the second, the "constant" is (-2/7) and the "term" is a^3.

The same ambiguity applies to (b): is it (-3x)^(2/8) or ((-3x)^2)/8. Since the first results in (-3)^(1/4), which is not a real number, I suspect you meant ((-3a)^2)/8= ((-3)^2 a^2)/8= (9/8)a^2.

Finally, in (c) do you mean -1/(5x) or (-1/5)x?