in the beginning he had x denarii. After leaving Lucca he had 2x - 12. After leaving Florence he had 2(2x - 12) - 12 = 4x - 36 In Pisa he had 2(4x - 36) - 12 =8x - 84 Now as he is left with nothing after returning home to pisa 8x-84=0 8x=84 x=84/8 x=10.5 denarii Solution in the beginning he had x denarii. After leaving Lucca he had 2x - 12. After leaving Florence he had 2(2x - 12) - 12 = 4x - 36 In Pisa he had 2(4x - 36) - 12 =8x - 84 Now as he is left with nothing after returning home to pisa 8x-84=0 8x=84 x=84/8 x=10.5 denarii.