You need at least two numbers to find an LCM. You probably have that here, but without spaces between them, we can't tell exactly what they are.
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The LCM is 78.
The LCM of 3 and 6 is 6 The LCM of 5 and 7 is 35. The LCM of 8 and 9 is 72. The LCM of 12 and 15 is 60.
The LCM of these numbers is 25y. LCM is Least Common Multiple.
LCM = 90
The LCM of these numbers is 900 . LCM is Least common multiple.