1) 72 + 814 + x = 886 + x
2) 605 + a + 615 + 718 = 1220 + 718 + a = 1938 + a
3) 725 + 5 + b = 730 + b
4) b + 72840 + 4 = b + 72844
5) 8164 + 908 + x = 9072 + x
6) 91793 + 307 + 23 + c = 92123 + c
7) a + 1092 + 29 + 25 + 15 = 1961 + a
8) x + 6738 + 834 + 123 = 7195 + x
9) 7585 + 35 + 95 + b = 7705 + b
10) 4932 + x + 128 + 4507 = 9567 + x