Determine every c Є R, for which the space [c,-1,-1], [2,3,c], [1,c,c]  has dimension 2  I found out, that the D of matrix should be < 3 My solution for matrix is: −c3+3⁢c2−c+3 So I tried the Gauussian elimination, but I got som weird fractions in matrix.  Don't know, how am I suppose to continue.  Will you help me please? Thank you.

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