Question

Could you fin v1, v2, and v3 in this circuit

Answer 1

Seeing there's no voltage source resistances any current can flow through them and effect nothing. Therefore V1, V2, V3 are known values.

Answer 2

V2 = 12V as it is the same node as 12V battery voltage
V1 = 2V as V1+10V = V2 =12V
V3 = -8V as V2-20V = V3

Answer 3

If u apply Principle of Superposition den ths circuit wil become very simple n den u can easily find v1 v2 v3 by aply any of circuit technique like KCL KVL