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2A -8 = D-4
D = 2A-4
A+4 = ¾(D+4)
4A+16 = 3D +12
4A = 3D -4
A = (3D-4)/4
D = 2(3D-4)/4 -4
D = 3D/2 - 6
(2-3)D/2 = -6
D = -6 x (-2)
D = 12 tahun