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For the following system: #1 + x2 + x1 + (a+2)x2 + 21 + I3 2x3 7x2 + (a+1)x3 1 = 5 =9 =

For the following system: #1 + x2 + x1 + (a+2)x2 + 21 + I3 2x3 7x2 + (a+1)x3 1 = 5 =9 = For what values of a does this system have solutions? For what values of a does it have exactly one solution? For what values of a does it have infinitely many solutions?

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