c = -2
6 = 9a + 3b
2 = 3a + b
0 = a + b
b = -a
2 = 3a - a
2 = 2a
a = 1
b = -1
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c = -2
6 = 9a + 3b
2 = 3a + b
0 = a + b
b = -a
2 = 3a - a
2 = 2a
a = 1
b = -1