3. Which equation is an identity?

A. –3y + 3 = –3y – 6

B. 9 – (2v + 3) = –2v – 6

C. 3w + 8 – w = 4w – 2(w – 4)

D. 7m – 5 = 8m + 7 – m

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.