Solve these simultaneous equations:

(a) a+ b= 3 and a– b= 5

(b) 2x+ 3y= 27 and 3x+ 2y= 23

(d) x+ y– 2z= -2 and 2x– y+ z= 9 and x+ 3y+ 2z= 4

(e) 4r– 2s+ 3t= 12 and r+ 2s+ t= -1 and 3r– s– t= -5

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