The LCM is 2520.
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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
LCM(21, 42, 18) = 126
-12 + 18 - (-15) = -12 + 18 +15 = 21
3, 6, 9, 12, 15, 18, 21, 24, 278, 16, 24, 32
18/21 x 15 is 12 6/7