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(a + 3b) + (a + 5b) = 28
2a + 8b = 28
a + 4b = 14
eliminasi:
a + 4b = 14
a + b = 5
__________ -
3b = 9
b = 3
a = 2
U9 = a + 8b
= 2 + 8(3)
= 26