@amit You aren't, but assuming you are thoroughly familiar with transforming between Norton and Thevenin, then: (1) V1 & R1 --> Ix & Rx; and, (2) Iy replaces Ix+I1; and, (3) Ry replaces Rx||R3; and, (4) Iy & Ry --> Vz & Rz; and, (5) Va replaces Vz+V2 and Ra replaces Rz+R2; and, (6) Vb & Rb replaces Va & divider Ra&R4; and, (7) Vc replaces Vb+V3; and, (8) Vc and Rc replaces Vb & divider Rb&R5. There are some interesting special cases you may see as you proceed in the above analysis. But, no matter, it's all about Norton/Thevenin conversions back and forth. Why don't you know the direction?
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