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Sn = 7/2 ( 2a + (n-1)b)
-7 = 7/2 ( 2.8 + ( 7-1)b)
-7 = 7/2 ( 16 + 6b)
-7 = 56 + 21b
-7 -56 = 21b
-63 = 21b
- 63/21 = b
-3 = b
maka hasil bedanya atau slisihnya adalah -3