How can i find the thevenin equivalent circuit for RL?

I converted the current source to a 5v source inseries with the 20ohm resistor but i always seem to get stuck when i have more than one source. I used superposition and got an Itotal of 0.5amps... whats next? Do the 50 and 150ohm resistors some into play or are they considered as a short circuit? Thanks in advance.

I converted the current source to a 5v source inseries with the 20ohm resistor but i always seem to get stuck when i have more than one source. I used superposition and got an Itotal of 0.5amps... whats next? Do the 50 and 150ohm resistors some into play or are they considered as a short circuit? Thanks in advance.

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