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2a + 8b = 76
a + 4b = 38 ... (1)
a + 8b = 50 ... (2)
eliminasi (1) dan (2):
a + 4b = 38
a + 8b = 50
__________ _
- 4b = - 12
b = 3
a = 26
U5 = a + 4b
= 26 + 4(3)
= 26 + 12
= 38