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U5 = a + 4b = 123
U8 = a + 7b = 105 _
-3b = 18
b = -6
a + 4b = 123
a + 4(-6) = 123
a - 24 = 123
a = 123 + 24
a = 147
jadi, suku pertamanya 147
semoga membantu ya :)