Write the equations of the reaction proceeding according to the following scheme Cu-Cuo-Cu

From this scheme Cu => CuO => Cu, two equations of chemical reactions must be derived.
To get from Cu – CuO, you need to add O2.
Cu + О2 = CuO.
To get from CuO – Cu, it is necessary for O2 to pass into the composition of another substance. To do this, you can add any substance, for example hydrogen.
As a result, we will get the following result.
CuO + H2 = Cu + H2O.
If we equate these reactions, then we get equations of the following form:
2Cu + О2 = 2CuO and CuO + Н2 = Cu + Н2О.