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57:3 + (247:13 + 1)*5:4 - 63:9 + 4
= 19 + (19 + 1)*5/4 - 7 + 4
= 19 + (20)*5/4 - 7 + 4
= 19 + 20*5/4 - 7 + 4
= 19 + 100/4 - 7 + 4
= 19 + 25 - 7 + 4
= 40