Converting the given circuit into its equivalent circuit as shown in figure

Applying Kirchhoff's Current Law (Junction law) at P with voltage V volts (say), we get

……… .. (i)

Current I form 15 V voltage source to node across resistor is

……… . (ii)

Current from 2 V voltage source to node acrose resistor is

……… (iii)

Similarly, current and from 3 V and 4 V voltage source to node across and resistors are

……… . (iv)

and ……… .. (v)

Using these values in equation , we get

Eliminating from both sides, we get

Now, current resistor is

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