Leslie keeps her doll collection in a display cabinet with glass doors. She also has 15 dolls from other countries…

Leslie keeps her doll collection in a display cabinet with glass doors. She also has 15 dolls from other countries on 5 shelves with the same number on each shelf. She also has 2 antique porcelain dolls on each shelf. Which equation can be used to find the number of dolls d, on each shelf?