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a + 5b = -14
a = -(14+5b)
u5+u4 = 2a + 7b = 20
2(-14-5b) + 7b = 20
-(10-7)b = 20+28 = 48
b = 48/-3 = -16
a = -14 -5x(-16) = 80-14 = 66
u8 = 66 -16x7 = 66 - 112 = -46