We used the mesh-current method to identify the meshes and assign the mesh currents; identified the special case of a current source as a component in two adjacent meshes, which we combine to form a supermesh; wrote a constraint equation for the supermesh; wrote a KVL equation for the supermesh; wrote a KVL equation for each remaining mesh where the current is unknown; wrote a dependent-source constraint equation for each dependent source; solved the KVL equations and constraint equation for the unknowns; and checked the solution by verifying that the power in the circuit balances. Now use the calculated values to find the voltage vo.