21V – 20V2 – V4 = 80 → Eq. 1 -40V1 + 49V2 – 4V3 = 0 → Eq.2 -2V2 + 5V3 – 2V4 = 0 → Eq. 3 -3V1 – 6V3 + 11V4 = 0 → Eq. 4 Answer: V1 = 25.52V V2 = 22.05V V3 = 14.842V V4 = 15.055V

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A: We can solve 1 problem only. Please repost the same for more answers.