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Find all real numbers a and b such that the following system of linear equations has: a) No solutions? b) One solution? c) Infinitely many

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Find all real numbers a and b such that the following system of linear equations has: a) No solutions? b) One solution? c) Infinitely many solutions? -2x2 + 4x3 + 4x4 = 4a - 26 - 3x1 - 5x2 - 5x3 -324 = -3 -2a 2x1 + 4x2 + (a + 4)x3 + 3x4 = 6+ 5 - 21 - 202 - 23 - -2

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