Question

At what temperature, the adiabatic change is equal to the isothermal change,?

Answer 1

This question is poorly formulated. You should include mention of the starting points (plural, allowing that the isothermal and adiabatic changes begin from different initial conditions).

If the initial temperatures are the same, the answer is trivial: Never! That's because the isothermal change leaves the temperature constant by definition while the adiabatic change will cause the temperature to depart from its initial value, creating a widening difference between the two.

Answer 2

If the initial temperature are the same, the answer is trivial: Never, that's because the isothermal change leaves the temperature constant by definition while the adiabatic change will cause the temperature to depart from the initial value creating a widening difference between two