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18-4,55-1,33
12,12
= 18 - 4,55 - 6 2/9
= 13,45 - 6 2/9
= 13 45/100 - 6 2/9
= 13 9/20 - 6 2/9
= 13 81/180 - 6 40/180
= 7 41/180