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4. Solve the following systems: (a) x + x2 + 2x3 = 8 - -x1 2x + 3x3 1 3x17x2 + 4x3 = 10

4. Solve the following systems: (a) x + x2 + 2x3 = 8 - -x1 2x + 3x3 1 3x17x2 + 4x3 = 10 (b) x+y+z=3 4x + 4y + 4z = 7 3xy + 2z = 5

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