Combine like terms. These are terms with exactly the same letters so the first three are unlike each other and cannot be combined. Use the distributive property on 7(a-2ab-5abc). That gets you 7a-14ab-35abc. Now combine the like terms:
7a and 5a = 12a
-7ab and -14ab = -21ab
6abc and -35abc = -29abc
12a-21ab-29abc is the answer.
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