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U1 = a = (x - 1)
U2 = (3x + 3)
U3 = (3x - 1)
b = U2 - U1 = (3x + 3) - (x - 1) = 2x + 4 ....1
b = U3 - U2 = (3x - 1) - (3x + 3) = -4......2
1 = 2
2x + 4 = - 4
2x = -8
x = -4
sehingga barisan aritmatika menjadi
-5, -9, -13