If those are the denominators, then the the negative part of -15 should be transferred to the numerator, eg if the fraction is 4/(-15) then make it (-4)/15, or if it is (-4)/(-15) make it (--4)/15 = 4/15.
Then the lcm of 15 and 10 is 30.
(Otherwise you are likely to have trouble in getting your signs right if you use a negative denominator.)
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Answer: 30 If those numbers are denominators, the least common denominator is the least common multiple of the three. In this case, 30 is the LCM of 6, 10 and 15, so 30 is the least common denominator.
least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
A common denominator, though not the least, is 150.
The least common denominator is 120.
The greatest common denominator is infinite. The least common denominator is 45.