6b4 / 5c4d4 / 3ab2 / 20c3d
Division is not associative and since there are no brackets (parentheses) the operations are evaluated from left to right.
Thus
6b4 / 5c4d4 = 6/5*b4c-4d-4
6b4 / 5c4d4 / 3ab2 = 6/5*b4c-4d-4/ 3ab2 = 2/5*a-1b2c-4d-4
6b4 / 5c4d4 / 3ab2 / 20c3d = 2/5*a-1b2c-4d-4/ 20c3d = 1/50*a-1b2c-7d-5 or b2/(50ac7d5)
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