A retired woman has $60,000 to invest but needs to make $7,000 a year from the interest to meet certain living expenses. She invests a portion of her money in a bond paying 9% annual interest. The rest of her money she wants to put in a certificate of deposit (CD) that pays 13% per year. If we let x be the amount the woman invests in the 9% bond, how much will she be able to invest in the CD?