63 over 84 as a decimal = 63 divided by 84 = 0.75
80 over 84 simplified = 20/21
84 over 90 simplified = 14/15
12 over 63 simplified = 4/21
65/84 cannot be simplified.
It is: 63/60 = 21/20 simplified
63/64 cannot be simplified further.
It is: 63/77 = 9/11 simplified
54/63 = 6/7 simplified
45/63 is 5/7 simplified
6/63 = 2/21 simplified
The simplified fraction of 15 over 63 is 5/21