100 - 12 : [10 + 10 : (a + b - 1)] = 99
12 : [10 + 10 : (a + b - 1)] = 100 - 99
12 : [10 + 10 : (a + b - 1)] = 1
10 + 10 : (a + b - 1) = 12 : 1
10 + 10 : (a + b - 1) = 12
10 : (a + b - 1) = 12 - 10
10 : (a + b - 1) = 2
a + b - 1 = 10 : 2
a + b - 1 = 5
a + b = 5 + 1
a + b = 6
a, b = nr naturale
Solutie:
(a,b) ∈ {(0,6);(1,5);(2,4);(3,3);(4,2);(5,1);(6,0)}\
- Lumberjack25
