3a + 26 = 6 - 2a
2K - 7 = 1
-5k = -45
-3m - 5 = 5m - 13
5x + 6 = 41
5x + 6 = 6
12 - 3x = 2x - 3
3y + 5.2 = 2 – 5y
-14 - 3n = -5n + 8
–2a – 9 = 6a + 15
Marc has 45 CDs in his collection, and Corinna has 61. If Marc buys 4 new CDs each month and Corinna buys 3 new CDs each month, after how many months will Marc and Corinna have the same number of CDs?