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2a - b -c = 5
3a - 3c = -9
2a - b - c = 5 (x2) 4a - 2b -2c = 10
3a + 2b - c = 5 (x1) 3a + 2b -c = 5
7a - 3c = 15
3a - 3c = -9
4a = 24
a= 6
3a - 3c = -9
3(6) - 3c = -9
18 - 3c = -9
3c = 27
c = 9
2a - b - c = 5
12 - b -9 = 5
3 - b = 5
b = -2
a + b + c = 6 - 2 + 9 = 13