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Da = Db
5x = 3x +8
5x-3x = 8
2x = 8
x= 8/2 = 4
Da = 5x = 5(4)=20cm
Db= 3x+8 = 3(4)+8= 20cm
8 = 5x - 3x
8 = 2x
x = 4
5x = 5(4) = 20 cm
3x + 8 = 3(4) + 8 = 12 + 8 = 20 cm