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## Homework Statement

Determine the value of the voltage Vx

across the 3A current source.

## Homework Equations

## The Attempt at a Solution

I am really confused about how to do it. What I thought of is to find the voltage across the 4 ohm resistance which is 12 V. I though of subtracting that from the power sources.

But I am not sure which power source should be positive and which one should be negative?

Should I just assume the bigger 6V to be positive just because it is the bigger power source?

I might be completely wrong on this one. So please help me. This is not really a homework problem, this is in one of my practice tests, so I would appreciate any proper explanation I can get, rather than vague hints.

Thank you.