9 * a = 36
a = 3
a = 4
a = 5
a = 6
10 * a = 70
a = 13
a = 7
a = 1
a * 13 = 130
a = 10
a = 100
a = 27
60 = a * 5
a = 60
a = 12
a = 14
99 = 9 * a
a = 11