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U7=38 -> a+6b = 38
eliminasi
a+2b = 18
a+6b = 38
__________ _
-4b = -20
b = 5
substitusi
a+2b = 18
a + 10 = 18
a = 8
S24
= 24/2 (2.8 + (24-1) 5)
= 12 (16 + 115)
= 12 . 131
= 1572
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