You might consider posting some of your work - even if you don't have much of an idea where to begin.
Even if you don't use conventional mesh analysis you might work out a solution.
For instance, you can make a good case for saying that the current (I2) in the 0.5 Ω resistor is 41xI1.
You can then use Kirchoff's voltage law to write the loop equation for the left hand loop entirely in one unknown - i.e. I1
Then you will be able to solve for I1 and then this will lead to another loop equation for the right hand loop in which V is the sole unknown. Then you have V.