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b = beta
a + b = -b/a = 7/2
a = 7/2 - b
2a + 3b = -8
2(7/2 - b) + 3b = -8
7 - 2b + 3b = -8
7 + b = -8
maka b = -15
a = 7/2 - (-15) = 7/2 + 15 = 37/2
maka (K-1)/2 = -15 x 37/2
(K-1)/2 = -555/2
maka
K -1 = -555
K = -554