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berdasarkan matriks itu, dapat diambil persamaan:
a + 2b = 1 ====> 2b = 1 - a
-2b - c = 2 ====> 2b = -c - 2
a + c = 1 ====> a = 1 - c
2b = 1 - a 2b = -c - 2
2b = 1 - (1 - c) c = -c - 2
2b = c 2c = -2
c = -1
a = 1 - c
a = 1 - (-1) 2b = -c - 2
a = 2 2b = -1 -2
2b = -3
b = -3/2
jadi a + b + c = 2 - 3/2 -1 = -1/2 (maaf kalo salah)