1. The problem statement, all variables and given/known data Apply the mesh current method to find I0 2. Relevant equations Mesh current method 3. The attempt at a solution On the left bottom square circuit, I set a mesh current, I1, and on the right bottom square circuit, I set a mesh current, I2. Then, I0=I1-I2. Since there is a current source on the mesh I1, I1=-5 (negative sign because of the direction.) and (1+2+4)I2+22.5=0, so I2=(-22.5)/7. Therefore, I0=-5-(-22.5)/7=(-12.5)/7. Am I doing it right?