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8x = 6(x+5)
8x = 6x + 30
8x - 6x = 30
2x = 30
x = 15
PD = 15 cm
PD/PD+AD = 6/8
PD/PD+5 = 3/4
PD(3) = PD+5 (4)
3PD = 4PD + 20
20 = 4PD - 3PD
20 = PD