6r+7=13+7r help plz linear equations

Aformual for 8 bottles of window cleaner calls for 6 cups of rubbing to customers alcohol 2 1/4 gallons of water and 1 1/2 cups of ammonia alcohol would the forula call if a factory made 1,280 bottles for stores to sell to customers

Can any one me with the answers to these questions asap?

Find the values of y: 3y^3(y^2+ 2/3y)=0