Подбери x так, чтобы получилось верно равенство:
12 * x = 12
x * 9 = 0
1 * x = 0
x * 586 = 586
12 * x = 12
x = 1
12 * 1 = 12
12 = 12
x * 9 = 0
x = 0
0 * 9 = 0
0 = 0
1 * x = 0
x = 0
1 * 0 = 0
0 = 0
x * 586 = 586
x = 1
1 * 586 = 586
586 = 586