Please explain how to do this.
Select all the expressions that are equivalent to -2/5 (15 - 20d + 5c).
Use distruibutive property to expand
-2/5 (15) + -2/5(-20d) + -2/5 (5c) and simplify
-6 + 8d - 2c re-arange to get
-2c +8d -6 and factor out - 2 to get
-2 (3 - 4d + c)