1260
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The LCM is: 84
The Least Common Multiple (LCM) for 42 70 84 is 420.The Greatest Common Factor (GCF) for 42 70 84 is 14.
Since x is a factor of both numbers, ignore it and find the LCM of 7 & 12. These two numbers do not share any factors, so their LCM is 7*12 = 84. Put the x back in for the final answer - 84x.
630
630