No, but 133 is.
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The first common multiple will be the least common multiple or LCM.Since 11 and 12 have no common factors, the LCM is 11x12 or 132.The numbers 11 and 12 are called relatively prime.
Yes
Least Common Multiple (LCM) for 132 99 is 396
18 times132 / 7 = 18.8571429
84/132 =7/11 (divide top and bottom by 12)