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3 = 1 + ix
ix = 3 - 1 = 2 A
vx = 12 - 6 = 6 V
(vb - 28) / 4 + vb / 2 + (vb - 7) / 1 = 0
vb - 28 + 2vb + 4vb - 28 = 0
7vb = 56
vb = 8 V
ir1 = (28 - 8) / 4 = 5 A
ir2 = 8 / 2 = 4 A
ir3 = (8 - 7) / 1 = 1 A
3 = 1 + ix
ix = 3 - 1 = 2 A
vx = 12 - 6 = 6 V
(vb - 28) / 4 + vb / 2 + (vb - 7) / 1 = 0
vb - 28 + 2vb + 4vb - 28 = 0
7vb = 56
vb = 8 V
ir1 = (28 - 8) / 4 = 5 A
ir2 = 8 / 2 = 4 A
ir3 = (8 - 7) / 1 = 1 A