Step 1:

Find the thevenins equivalent voltage.

1.Open the load resistor.

2.Calculate the Open Circuit Voltage. This is the Thevenin Voltage .

Redraw the circuit :

Find the current in loop.

.

Voltage due to the resistor .

.

Step 2:

Find Thevenin Voltage .

Thevenin Voltage .

.

Therefore Thevenin Voltage .

Solution :

Thevenin Voltage is .