The following systems of equations are given: (x+ ay +z = 1 ax+ a'y+z 2+a ax+3ay +z = 2-t x + 3y + x + 2y + |3x - y 5z = 3z = (a + 5): = -a - 7 (2 (1 For each of them, set the values a /a,t for them to the system: i. There is a single solution.

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