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Step 1:

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Find the Thevinins equivalent resistance.

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1.Open the load resistor.

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2.Open Current Sources and Short Voltage Sources.

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3.Calculate the Open Circuit Resistance. The resultant open circuit resistance is the thevenin Resistance (R_TH).

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Redraw the circuit :

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Observe the circuit,

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The Resistors  and are in series.

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.

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Above series resultant comes in paralle with the resistance .

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The Resistors  and are in series.

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.

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Above series resultant comes in paralle with the resistance .

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.

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Thus, the resultants ,  and are in series.

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Equivalent reistance is .

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.

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Thevinins equivalent resistance is .

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