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The LCM is 280a4b2.
LCM(7ab, 8a3b2, 10a4) = 280a4b2
35ab squared
the greatest common factor of 8a3b2 and 12ab4 is 24a3b4
7ab
-2ab
12ab
280a4b2
35ab
7ab-5ab = 2
7ab itself
7b
2•5•a•a•a•a