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Un = a + (n-1)b
U₁₅ = 9 + (15-1) b = 135
9+14b=135
14b=126
b = 9
jadi bedanya 9 hehehe
135 = 9 + (15-1)b
135 - 9 = (15-1)b
126 : 14 = b
beda = 9