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U5 = a + 4b = 22
U12 = a + 11b = 57 _
-7b = -35
b = 5
a + 4 (5) = 22
a + 20 = 22
a = 22 - 20
a = 2
U15 = a + 14b
= 2 + 14 (5)
= 2 + 70
= 72
semoga membantu ya :)
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