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(-2) 3a+2b+c=5
a+4b+5c=11
-6a-4b-2c=-10
-5a // -3c= -1
(1) 3a-2b+c=5
(2) 4a+b-37c=-26
3a-2b+c=5
8a+2b-74c= -85
11a // -73c= -80