Jake has decided to invest in three business ventures. The total cost of investing in all three ventures is $15,000. The co and third ventures is $7,000 more than the investment in the second venture. According to Jake's research, his investment after three years, and the investments in the other two ventures will double in the same périod, making the total value of Jake's investment in the first venture is $____his investment in the second venture is $ ____and his investment is $____.