x - numărul
x - x / 6 - 1 = y
y - y / 9 - 4 = z
z - z / 7 - 6 = a
a - a / 3 - 2 = b
b - b / 2 - 20 = 1
b - b / 2 - 20 = 1
b - b / 2 = 21
2b / 2 - b / 2 = 21
b / 2 = 21
b = 42
a - a / 3 - 2 = 42
a - a / 3 = 44
3a / 3 - a / 3 = 44
2a / 3 = 44
2a = 132
a = 66
z - z / 7 - 6 = 66
z - z / 7 = 72
7z / 7 - z / 7 = 72
6z / 7 = 72
6z = 504
z = 84
y - y / 9 - 4 = 84
y - y / 9 = 88
9y / 9 - y / 9 = 88
8y = 792
y = 99
x - x / 6 - 1 = 99
x - x / 6 = 100
6x / 6 - x / 6 = 100
5x / 6 = 100
5x = 600
x = 120
- Tricks -