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Verified answer
U8 = a + 7b = -20U2 = a + b = 4
------------------------ -
6b = -24
b = -24/6
b = - 4
a + b = 4
a - 4 = 4
a = 4 + 4 = 8
U5 = a + 4b
U5 = 8 + 4(-4)
U5 = 8 - 16
U5 = -8
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