2(6e - 3f + 10g) is the given equation. Because of the grouping, we know that the entire part in parentheses is multiplied by two. Now the distributive property helps us by letting us multiply each individual part of the parentheses by two.
6e becomes 12e
-3f becomes -6f
and 10g becomes 20g
Now when we put those together, it becomes 12e - 6f + 20g
