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H
8.) -5x + y - 4z= 60
2x + 4y + 3z= -12
6x - 3y - 2z= -52
9.) 4a + 5b - 6c= 2
-3a - 2b + 7c= -15
-a + 4b + 2c= -13
14.) 8x + 3y + 6z= 43
-3x + 5y + 2z= 32
5x - 2y + 5z= 24
15.) -6x - 5y +4z= 53
5x + 3y + 2z= -11
8x - 6y + 5z= 4...