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8 = 4 (2a + 7b)
2a + 7b = 8/4
2a = 2 - 7b
lalu masukan 2a ke,
S16 = 16/2 (2a + 15b)
144 = 8 ( 2-7b + 15b )
144 = 8 ( 2 + 8b )
144 = 16 + 64b
128 = 64b
b = 2
lalu masukan b untuk mencari a
S8 = 8/2 (2a + 7b)
8 = 4 ( 2a + 7(2) )
8 = 8a + 56
8a = -48
a = -6
semoga membantu