1/3 = 0.333 repeating
3/3 = 0.999 repeating
1 = 0.999 repeating
10x= 9.999r
10x - x = 9.999r - .999r
9x = 9
x = 1
.999r = 1
1/3 = 0.333 repeating
3/3 = 0.999 repeating
1 = 0.999 repeating