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B =
A=2B^{T}
I. 4 = 2a -> a = 2
II. 2c - 3b = a -> 2c - 3b = 2 |x2|4c - 6b = 4
c - 2b = 14 |x3|3c - 6b = 52
⁻
c = -48
III. 2b = 4a + 2c -> 2b = 4(2) + 2(-48) -> 2b = -78 -> b = -39
a + b + c = 2 + (-39) + (-48) = -85