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12/57 can be simplified to 4/19
To find the LCM, just keep multiplying until you find the answer 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36 12, 24, 36 18, 36 36
The LCM is: 52
The LCM of 4 and 6 is 1212
The LCM is 196.